It's wise to take office for licit activity (7)
I believe the answer is:
politic
'it's wise' is the definition.
(associated in meaning)
'office for licit activity' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'licit' is 'litic' which is present in the answer.
The remaining letters 'po' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'to take' is the link.
Can you help me to learn more?
(Other definitions for politic that I've seen before include "Intriguing" , "Prudent, judicious" , "Shrewdly tactful" , "Sensible, judicious" , "Prudent and tactful" .)