Pet about to return, so put out food? (5)
I believe the answer is:
cater
'so put out food?' is the definition.
(I've seen this before)
'pet about to return' is the wordplay.
'pet' becomes 'cat' (cats are often kept as pets).
'about' becomes 're' ('re' means regarding or about).
'to return' says the letters should be written in reverse.
're' reversed gives 'er'.
'cat'+'er'='CATER'
(Other definitions for cater that I've seen before include "React (anag.)" , "Trace (anag.)" , "Supply food for parties" , "Provide for, supply" , "... you'll see minister" .)