Put down, with help by the left (4)
I believe the answer is:
laid
'put down' is the definition.
(I've seen this before)
'help by the left' is the wordplay.
'help' becomes 'aid' ('aid' can be a synonym of 'help').
'by' means one lot of letters go next to another.
'the left' becomes 'l' (common abbreviation).
'aid' after 'l' is 'LAID'.
'with' is the link.
(Other definitions for laid that I've seen before include "Flattened by wind and rain" , "Deposited" , "Doze" , "Wagered" , "Placed horizontally on a surface" .)