Different ten said to be as a replacement (7)
I believe the answer is:
instead
'be as a replacement' is the definition.
(I've seen this in another clue)
'different ten said' is the wordplay.
'different' indicates anagramming the letters (letters placed in a different order).
'ten'+'said'='tensaid'
'tensaid' anagrammed gives 'INSTEAD'.
'to' is the link.
(Other definitions for instead that I've seen before include "In place (of)" , "Rather - detains (anag)" , "as an alternative option" , "As a substitute" , "Alternatively" .)