Tense revolutionary in family room (7)
I believe the answer is:
kitchen
'room' is the definition.
(I know that kitchen is a type of room)
'tense revolutionary in family' is the wordplay.
'tense' becomes 't' (abbreviation used in many dictionaries).
'revolutionary' becomes 'Che' (Che Guevara the Marxist revolutionary).
'in' indicates putting letters inside.
'family' becomes 'kin' (synonyms).
't'+'che'='tche'
'tche' put into 'kin' is 'KITCHEN'.
(Other definitions for kitchen that I've seen before include "Room for food" , "Where heat's to be stood" , "Place to cook" , "Room with proverbial heat" , "Cooking area" .)