Henry's house party in revolutionary groove (5)
I believe the answer is:
tudor
'henry's house' is the definition.
(the House of Tudor was founded by Henry VII)
'party in revolutionary groove' is the wordplay.
'party' becomes 'do' (do is a kind of party).
'in' indicates putting letters inside.
'revolutionary' says the letters should be written backwards.
'groove' becomes 'rut' (synonyms).
'rut' reversed gives 'tur'.
'do' put into 'tur' is 'TUDOR'.
(Other definitions for tudor that I've seen before include "Member of royal family" , "(Pertaining to) royal house" , "Regal family" , "Style of architecture in 15th c. England" , "Architectural style" .)