Ship's captain, delicate flier? (7)
I believe the answer is:
skipper
I believe this clue is a double definition.
'ship's captain' is the first definition.
(I've seen this before)
'delicate flier?' is the second definition.
(small butterfly with rapid darting flight)
(Other definitions for skipper that I've seen before include "Captain - small butterfly - fish" , "delicate winger?" , "Shakespeare's giddy youth" , "Captain - one using a rope" , "Trawler boss" .)