Study training stratagem (6)
I believe the answer is:
peruse
'study' is the definition.
(thesaurus)
'training stratagem' is the wordplay.
'training' becomes 'pe'.
'stratagem' becomes 'ruse' (I've seen this before).
'pe'+'ruse'='PERUSE'
(Other definitions for peruse that I've seen before include "Thoroughly examine" , "Survey" , "Examine at length" , "'Read through, browse (6)'" , "Run one's eye over" .)