Seat of learning regularly infers vicar is in Pacific islands (9)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

Seat of learning regularly infers vicar is in Pacific Islands POLY (=seat of learning, i.e. polytechnic) + <i> N <f> E <r> S <v> I <c> A <r>; “regularly” means alternate letters only are used