If you were had interviews for posts at two different universities and were successful for both, how would you play it? So:
Uni A - already work there part-time. Interview is first. Say, you're successful but you know you have another interview lined up a week later at Uni B, for which you've got a very good chance.
Uni A head of dept will likely (probably informally) ask if you've applied for Uni B job. He's on the interviewing panel but you see each other a fair bit whilst you're teaching/in meetings, etc
Do you say yes to the first job offer, not sign anything until you know the outcome of interview for uni B? Or, do you come completely clean if HOD of Uni A asks before/after interview if you've applied for Uni B post, risking Uni A not giving you the job/withdrawing the offer/putting pressure on you to advise if you're taking uni the first job offer?
You don't, at this stage, know which uni you'd like to work for.