Subject a student finds newsworthy (7)
I believe the answer is:
topical
'newsworthy' is the definition.
(I've seen this in another clue)
'subject a student' is the wordplay.
'subject' becomes 'topic' (as in a topic for discussion).
'student' becomes 'L' (as in L-plates for learner drivers).
'topic'+'a'+'l'='TOPICAL'
'finds' is the link.
(Other definitions for topical that I've seen before include "currently newsworthy" , "In the news" , "Of interest at the present time" , "Contemporary" , "Of local interest" .)