Grand family eating her pickle (7)
I believe the answer is:
gherkin
'pickle' is the definition.
(gherkin is a kind of pickle)
'grand family eating her' is the wordplay.
'grand' becomes 'G' (G is short for ground as in a thousand).
'family' becomes 'kin' (synonyms).
'eating' is an insertion indicator.
'g'+'kin'='gkin'
'gkin' going around 'her' is 'GHERKIN'.
(Other definitions for gherkin that I've seen before include "Small cucumber, usually pickled" , "Immature fruit of cucumber" , "La traviata composer" , "Cucumber - London skyscraper" , "Type of small cucumber" .)