Believe house comes with vacant grounds (4)
I believe the answer is:
hold
'believe' is the definition.
('hold' can be a synonym of 'believe')
'house comes with vacant grounds' is the wordplay.
'house' becomes 'ho' (abbreviation for house).
'comes with' is a charade indicator (letters next to each other).
'vacant' means to remove the middle letters.
'grounds' becomes 'land'.
'land' with its middle removed is 'ld'.
'ho'+'ld'='HOLD'
(Other definitions for hold that I've seen before include "Cargo area of ship" , "Maintain" , "Ship's cargo area" , "Ship's storage area" , "defend successfully" .)