Men with little money for trees (6)
I believe the answer is:
maples
'trees' is the definition.
(maple is a kind of tree)
'men with little money' is the wordplay.
'men' becomes 'males' (I've seen this in another clue).
'with' means one lot of letters goes inside another.
'little money' becomes 'p' (pence).
'males' placed around 'p' is 'MAPLES'.
'for' is the link.
(Other definitions for maples that I've seen before include "Acer trees" , "Acers" , "(Canadian) trees" , "MP sale of trees" , "Trees of Canada" .)