Finish off with hair in beehive style? (3,2)
I believe the answer is:
mop up
'finish off' is the definition.
(synonyms)
'with hair in beehive style?' is the wordplay.
'with' says to put letters next to each other.
'hair' becomes 'mop' (I've seen this before).
'in beehive style?' becomes 'up' (I can't justify this - if you can you should give a lot more credence to this answer).
'mop'+'up' is 'MOP-UP'.
Can you help me to learn more?
(Other definitions for mop up that I've seen before include "Complete final stage (of a task)" , "Clear away, dispose of" , "take care of" , "Kill (enemy stragglers)" , "Finish off a task, clean away remnants" .)