Limited study time (5)
I believe the answer is:
scant
'limited' is the definition.
(thesaurus)
'study time' is the wordplay.
'study' becomes 'scan' (I've seen this before).
'time' becomes 't'.
'scan'+'t'='SCANT'
(Other definitions for scant that I've seen before include "In short supply" , "Scarcely sufficient" , "Little" , "Reduce" , "Barely adequate" .)