Help a worker after loan (4,1,4)
I believe the answer is:
lend a hand
'help' is the definition.
(thesaurus)
'a worker after loan' is the wordplay.
'worker' becomes 'hand' (hand is a kind of worker).
'after' says to put letters next to each other.
'loan' becomes 'lend' ('lend' can be a synonym of 'loan').
'a'+'hand'='ahand'
'ahand' put after 'lend' is 'LEND A HAND'.
(Other definitions for lend a hand that I've seen before include "Turn to and help" , "Provide help" , "temporarily transfer an employee" , "To assist" , "Pitch in" .)