Saint at the Pearly Gates? (5)
I believe the answer is:
peter
'saint at the pearly gates?' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for peter that I've seen before include "Boy's name (maybe blue)" , "Safe; saint" , "Dwindle away to nothing" , "foundation for church" , "and 16: Actor who played Hercule Poirot" .)