Help turn the handle as well (4,1,4)
I believe the answer is:
lend a hand
'help' is the definition.
(I've seen this before)
'turn the handle as well' is the wordplay.
'turn' indicates an anagram.
'as well' becomes 'and' (I've seen this in other clues).
'handle' with letters rearranged gives 'lendah'.
'lendah'+'and'='LEND A HAND'
(Other definitions for lend a hand that I've seen before include "Give assistance" , "Pitch in" , "temporarily transfer an employee" , "Turn to and help" , "Provide help" .)