Help to give worker influence (4)
I believe the answer is:
hand
This clue is a quadruple definition!!
'help' is the first definition.
(hand is a kind of help)
'to give' is the second definition.
(synonyms)
'worker' is the third definition.
(hand is a kind of worker)
'influence' is the fourth definition.
(thesaurus)
(Other definitions for hand that I've seen before include "Manual worker" , "Help < and applause" , "Pass" , "Worker; body part" , "Worker; pointer" .)