Delicate creature resides in college -- no men allowed over (7)
I believe the answer is:
anemone
'delicate creature' is the definition.
(sea anemone)
'resides in college no men allowed over' is the wordplay.
'resides in' says the answer is hidden in the clue.
'over' is a reversal indicator.
'enomena' can be found hidden inside 'college no men allowed'.
'enomena' backwards is 'ANEMONE'.
(Other definitions for anemone that I've seen before include "Pretty flower or sea animal" , "Plant with brightly coloured flowers - found also in sea" , "Woodland plant - marine polyps" , "White woodland flower" , "Plant with bright flowers" .)