Student always has crowbar (5)
I believe the answer is:
lever
'crowbar' is the definition.
(I've seen this in another clue)
'student always' is the wordplay.
'student' becomes 'l' (as in L-plates for learner drivers).
'always' becomes 'ever' (synonyms).
'l'+'ever'='LEVER'
'has' is the link.
(Other definitions for lever that I've seen before include "Rigid bar pivoted about a fulcrum" , "Means of exerting force" , "Heavy bar" , "Rod" , "Purchase from bar" .)