Gear revolutionary with new galley (7)
I believe the answer is:
kitchen
'galley' is the definition.
(I've seen this before)
'gear revolutionary with new' is the wordplay.
'gear' becomes 'kit' (kit is a kind of gear**).
'revolutionary' becomes 'che' (Che Guevara the Marxist revolutionary).
'with' means one lot of letters go next to another.
'new' becomes 'n'.
'kit'+'che'+'n'='KITCHEN'
(Other definitions for kitchen that I've seen before include "Place to cook" , "Room for food" , "Place for cooking food" , "Site of 4 [GAS OVEN]" , "Room for preparing meals" .)