Voids member with links supporting Spain (7)
I believe the answer is:
empties
'voids' is the definition.
('empty' can be a synonym of 'void')
'member with links supporting spain' is the wordplay.
'member' becomes 'mp'.
'with' is a charade indicator (letters next to each other).
'links' becomes 'ties' (tying is a kind of linking**).
'supporting' says to put letters next to each other (in a down clue, some letters go below others).
'spain' becomes 'e' (abbreviation for Espana).
'mp' next to 'ties' is 'mpties'.
'mpties' put after 'e' is 'EMPTIES'.
(Other definitions for empties that I've seen before include "Voids" , "Returned bottles" , "Vacates" , "Dead men" , "drains" .)