Oh, Keely -- in trouble? I may see you through this (7)
I believe the answer is:
'i may see you through this' is the definition.
(someone may look through a keyhole)
'oh keely in trouble?' is the wordplay.
'in trouble?' indicates an anagram (I've seen 'in trouble' mean this).
'ohkeely' anagrammed gives 'KEYHOLE'.
(Other definitions for keyhole that I've seen before include "Aperture in lock - kind of surgery", "It provides access to wards", "Opening in door etc", "Type of surgery", "Sort of surgery".)