A bit of a bargain, darling (7)
I believe the answer is:
snippet
'a bit' is the definition.
(I've seen this in another clue)
'bargain darling' is the wordplay.
'bargain' becomes 'snip' (slang term for a good deal).
'darling' becomes 'pet' (both are terms of endearment).
'snip'+'pet'='SNIPPET'
'of a' is the link.
(Other definitions for snippet that I've seen before include "excerpt of literature?" , "Brief extract" , "Scrap (of information, news etc)" , "Fair --, knitwear style" , "A cutting" .)