Not acting, arrange an evening out (6)
I believe the answer is:
offset
This might be a double definition.
'not acting' is the first definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'arrange an evening out' is the second definition.
(to offset something is to even something out)
Can you help me to learn more?
(Other definitions for offset that I've seen before include "Amount by which a thing is out of line" , "Counterbalance(d)" , "Amount by which something is out of line" , "make an effort" , "Compensate for - printing method" .)