Feels bitter about lease payments covering empty stable (7)
I believe the answer is:
resents
'feels bitter about' is the definition.
('resent' can be a synonym of 'feel bitter about')
'lease payments covering empty stable' is the wordplay.
'lease payments' becomes 'rents'.
'covering' indicates putting letters inside.
'empty' means to remove the middle letters.
'stable' with its centre removed is 'se'.
'rents' going around 'se' is 'RESENTS'.
(Other definitions for resents that I've seen before include "Takes offence" , "Begrudges" , "grudges" .)