Cryptic Crossword help - "Square arena in Hertfordshire" (5)

[CaribouCarafe]

Stuck on the last clue of my cryptic and it's driving me mental, so asking for help!

I think the following letters are correct: T I G but can't think of any word that would make sense for the clue!

Tring?

Tring?

X post!

Amazing, that's it! Market = square, and Tring is a market town in Hertfordshire. Thank you so much!

Doesn't it parse "T" square (thing used as a drawing guide) plus "ring" for arena?

You just made me google what a T square was! So now I've learnt two things today - that Tring exists, and what a T Square is. This is why I love cryptics (and mumsnet!)

I'm very fond of cryptic crosswords, they're great for learning new things.
And it helped that my father used to use a T square in his job.

I would have never got this if I'd thought about it for the rest of my life. How do you do this?

My mum does cryptic crosswords all the time and actually blows my mind how she puts it all together. I'm normally pretty rubbish at them but Tring just jumped out at me - if you hadn't heard of Tring it would be pretty impossible!

I live so close to Tring ...still would never have occurred to me.

The more you do cryptics the more you learn that they have their own language.
I cut my solving teeth on the Telegraph in my late teens mumblety-many years ago.
I've now progressed to the Times and the Guardian but I'm still not as good as DH. We solve them together as it's more fun and we have different areas of knowledge. For example, he'd have known where Tring was!
If you're interested in taking it up as a hobby, the Times does a Quick Cryptic in Times2 and there's an online blog called timesforthetimes where each clue is dissected and explained.
For example one clue today was:

Rush sculpture by the Parisian (6)

and the blogger explained:

BUSTLE – BUST for “sculpture”; LE for “the Parisian” (“the” in French).