Support sweetheart getting to bank (4)
I believe the answer is:
brae
'to bank' is the definition.
(I've seen this before)
'support sweetheart getting' is the wordplay.
'support' becomes 'bra' (a support for the breasts).
'sweetheart' becomes 'e' (the heart/centre of 'sweet').
'getting' is a charade indicator (letters next to each other).
'bra'+'e'='BRAE'
(Other definitions for brae that I've seen before include "Bear up on Scottish hillside" , "Slope on hill or in glen" , "Steep bank or hillside" , "Scots bank or hillside" , "bank on Clydeside" .)