Help idiot first (6)
I believe the answer is:
assist
'help' is the definition.
(assisting is a kind of helping)
'idiot first' is the wordplay.
'idiot' becomes 'ass' (I've seen this before).
'first' becomes 'ist'.
'ass'+'ist'='ASSIST'
(Other definitions for assist that I've seen before include "Pass to scorer" , "Help member" , "Be useful to" , "Provide aid, help out" , "Support" .)