Prudent student after answer that's governmental (9)
I believe the answer is:
political
'governmental' is the definition.
(similar in meaning)
'prudent student after answer' is the wordplay.
'prudent' becomes 'politic' (I've seen this before).
'student' becomes 'L' (as in L-plates for learner drivers).
'after' says to put letters next to each other.
'answer' becomes 'a' (abbreviation eg in Q and A).
'l' after 'a' is 'al'.
'politic'+'al'='POLITICAL'
'that's' is the link.
(Other definitions for political that I've seen before include "for parties?" , "Governmental" , "Involved with affairs of state" .)