Support facility by pound (5)
I believe the answer is:
easel
'support' is the definition.
(easel is a kind of support)
'facility by pound' is the wordplay.
'facility' becomes 'ease' (facility can mean ease or absence of difficulty).
'by' says to put letters next to each other.
'pound' becomes 'L' (abbreviation e.g. Lsd - pounds, shillings, pence).
'ease'+'l'='EASEL'
(Other definitions for easel that I've seen before include "Artist's equipment" , "Artist's supporting frame" , "board support" , "supporter of board, perhaps" , "Painter's frame" .)