Call back to support the woman that used to make gramophone records (7)
I believe the answer is:
shellac
'that used to make gramophone records' is the definition.
(gramophone records were made of shellac)
'call back to support the woman' is the wordplay.
'back' says the letters should be written backwards.
'to support' is a charade indicator (letters next to each other) (in a down clue, some letters hold others up).
'the woman' becomes 'she' ('she' refers to a woman).
'call' written backwards gives 'llac'.
'llac' put after 'she' is 'SHELLAC'.
(Other definitions for shellac that I've seen before include "Material of pre-vinyl 78 rpm records" , "Sort of resin" , "Take a shine to" , "(it's in old records)" , "Resin in flakes, used to making varnish" .)