Your compiler’s turn to catch a butterfly, perhaps (5)
I believe the answer is:
imago
'butterfly perhaps' is the definition.
(imago is the adult form of an insect)
'your compiler's turn to catch a' is the wordplay.
'your compiler's' becomes 'I'm' ('your compiler' refers to the crossword compiler).
'turn' becomes 'go' (a person's move in a board game).
'to catch' indicates putting letters inside.
'im'+'go'='imgo'
'imgo' enclosing 'a' is 'IMAGO'.
(Other definitions for imago that I've seen before include "Winged insect -- amigo (anag)" , "Adult, post-metamorphosis insect" , "For example, monarch ultimately" , "Perhaps butterfly" , "spinner, say" .)