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)
'take office for licit activity' is the wordplay.
'take office' becomes 'po' (I am not sure about this - if you are sure you should believe this answer much more).
'for' means one lot of letters go next to another.
'activity' indicates anagramming the letters (letters become active).
'licit' is an anagram of 'litic'.
'po'+'litic'='POLITIC'
'to' acts as a 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" .)