Force her family to have something pickled (7)
I believe the answer is:
gherkin
'have something pickled' is the definition.
I can't tell whether this definition defines the answer.
'force her family' is the wordplay.
'force' becomes 'G' (short for gravity).
'family' becomes 'kin' (synonyms).
'g'+'her'+'kin'='GHERKIN'
'to' is the link.
Can you help me to learn more?
(Other definitions for gherkin that I've seen before include "Cucumber for pickling" , "Variety of small cucumber" , "Small cucumber pickled whole" , "often pickled" , "Vegetable of the cucumber family" .)