As a replacement or alternative (7)
I believe the answer is:
instead
I believe this is a double definition.
'as a replacement' is the first definition.
(I've seen this in another clue)
'alternative' is the second definition.
(I've seen this before)
(Other definitions for instead that I've seen before include "Rather - detains (anag)" , "As a substitute" , "use this as a replacement" , "as an alternative option" , "Alternatively" .)