Distinguish from intellect (4)
I believe the answer is:
tell
'distinguish' is the definition.
('tell' can be a synonym of 'distinguish')
'from intellect' is the wordplay.
'from' says the answer is hidden in the clue.
'TELL' can be found hidden inside 'intellect'.
(Other definitions for tell that I've seen before include "Count - give an account" , "Make a difference" , "Notify" , "Issue instructions" , "William .... was legendary Swiss hero-archer" .)