Wife bitten by a hawk too (2,4)
I believe the answer is:
as well
'too' is the definition.
(synonyms)
'wife bitten by a hawk' is the wordplay.
'wife' becomes 'w'.
'bitten by' is an insertion indicator (I've seen this in other clues).
'hawk' becomes 'sell' (I've seen this in other clues).
'a'+'sell'='asell'
'w' placed into 'asell' is 'AS WELL'.
(Other definitions for as well that I've seen before include "on top" , "with equal effect" , "A swell sort of addition" , "Also, additionally" , "Appropriate" .)