Finish each place the wrong way (3,2)
I believe the answer is:
eat up
'finish' is the definition.
(synonyms)
'each place the wrong way' is the wordplay.
'each' becomes 'ea' (abbreviation).
'place' becomes 'put' (synonyms).
'the wrong way' shows that the letters should be reversed in order.
'put' in reverse letter order is 'tup'.
'ea'+'tup'='EAT UP'
(Other definitions for eat up that I've seen before include "Finish one's food" , "Finish course" , "Consume, absorb" , "Exhaust" , "finish meal" .)