Use for support (4,2)
'use for support' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for lean on that I've seen before include "Intimidate - turn to for advice, support etc" , "bully" , "Cling to" , "Informally, try to influence by intimidation - rest against" , "Seek support from" .)