Form of insect giving single male a turn (5)
I believe the answer is:
imago
'form of insect' is the definition.
(imago is the adult form of an insect)
'single male a turn' is the wordplay.
'single' becomes 'I' (one).
'male' becomes 'm' (common abbreviation).
'turn' becomes 'go' (a person's move in a board game).
'i'+'m'+'a'+'go'='IMAGO'
'giving' is the link.
(Other definitions for imago that I've seen before include "being immature?" , "Fully developed insect" , "Insect at end of life" , "Beetle, for example" , "A mental picture" .)