Money, for instance, as support (3)
I believe the answer is:
leg
'support' is the definition.
(leg is a kind of support)
'money for instance' is the wordplay.
'money' becomes 'l' (L can mean 'pounds'**).
'for instance' becomes 'eg' ('e.g.' can be a synonym of 'for instance').
'l'+'eg'='LEG'
'as' is the link.
(Other definitions for leg that I've seen before include "part of course" , "Lower limb" , "Stage (of race)" , "Gigot" , "Member" .)