Sunak on the offensive ultimately gets support for proposal (4)
I believe the answer is:
knee
'support for proposal' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'sunak on the offensive ultimately' is the wordplay.
'ultimately' indicates one should take the final letters.
The last letters of 'sunak on the offensive' are 'KNEE'.
'gets' acts as a link.
Can you help me to learn more?
(Other definitions for knee that I've seen before include "One has a cap" , "Leg bender" , "Hinge between the thigh and the shin" , "Joint protected by the patella" , "Hinged joint" .)