Play about a singer (4)
I believe the answer is:
lark
I believe this clue is a double definition.
'play about' is the first definition.
(I've seen this before)
'a singer' is the second definition.
(lark is a kind of birdanimal)
(Other definitions for lark that I've seen before include "Mischievous game" , "carefree adventure" , "Rise with this bird to get up early" , "Singing bird and piece of harmless mischief" , "Mischievous activity" .)