Instruct in art maybe (5)
I believe the answer is:
train
'instruct' is the definition.
(training is a kind of instructing)
'in art maybe' is the wordplay.
'maybe' indicates an anagram.
'in'+'art'='inart'
'inart' is an anagram of 'TRAIN'.
(Other definitions for train that I've seen before include "one thing after another" , "instruct and > discipline" , "Rail service" , "Engine and carriages" , "Learn a skill etc. through practice" .)