Without love, embittered and redundant (7)
I believe the answer is:
surplus
'redundant' is the definition.
(I know that redundant can be written as surplus)
'without love embittered and' is the wordplay.
'without' indicates named letters should be taken away.
'love' becomes 'o' (love means zero in tennis).
'embittered' becomes 'sour' (I've seen this before).
'and' becomes 'plus'.
'sour' with 'o' taken away is 'sur'.
'sur'+'plus'='SURPLUS'
(Other definitions for surplus that I've seen before include "Surfeit" , "Unneeded extra" , "Remainder" , "Excess, extra" , "a bit over the top" .)