Play about singer? (4)
I believe the answer is:
lark
This clue is a double definition.
'play about' is the first definition.
(I've seen this before)
'singer?' is the second definition.
(lark is a kind of birdanimal)
(Other definitions for lark that I've seen before include "Small songbird or playful action" , "Early riser" , "flier" , "Amusing adventure; bird" , "Bit of fun - early-rising bird?" .)