Considerate socialist family (7)
I believe the answer is:
kindred
'family' is the definition.
(kindred means one's relatives)
'considerate socialist' is the wordplay.
'considerate' becomes 'kind' (similar in meaning).
'socialist' becomes 'red' (socialism is often associated with the colour red).
'kind'+'red'='KINDRED'
(Other definitions for kindred that I've seen before include "Similarity in character" , "Associated - relations" , "Related by blood or marriage" , "Relationship by blood" , "Family and relations" .)