Fun and games for birds (5)
I believe the answer is:
larks
This clue is a double definition.
'fun and games' is the first definition.
(I've seen this before)
'birds' is the second definition.
(lark is a kind of bird)
'for' acts as a link.
(Other definitions for larks that I've seen before include "Early birds" , "Fun and games" , "Flyers who tweet" , "High jinks" , "Small songbirds" .)