Finish cleaning second little pet (3,2)
I believe the answer is:
mop up
This could be a double definition.
'finish cleaning' is the first definition.
(I've seen this in another clue)
'second little pet' is the second definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe you can see a link between them that I can't see?
Can you help me to learn more?
(Other definitions for mop up that I've seen before include "Swab" , "Deal with spillage or defeated enemy" , "Clear away, dispose of" , "Finish a task, clear away remnants" , "take care of" .)