Grant in bed really cut up? (7)
I believe the answer is:
blended
'cut up?' is the definition.
(crushed or cut up in a blender)
'grant in bed' is the wordplay.
'grant' becomes 'lend' (I can't justify this - if you can you should give a lot more credence to this answer).
'in' means one lot of letters goes inside another.
'lend' put within 'bed' is 'BLENDED'.
'really' acts as a link.
I am not very happy about this link. It may belong to another bit of the clue.
Can you help me to learn more?
(Another definition for blended that I've seen is " Mixed together".)