Some instructed, if you instruct (5)
I believe the answer is:
edify
'instruct' is the definition.
(edifying is a kind of instructing)
'some instructed if you' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'EDIFY' can be found hidden inside 'instructed if you'.
(Other definitions for edify that I've seen before include "improve mentally" , "Enlighten" , "Improve understanding" , "Educate, uplift" , "Improve the minds of" .)