In carving grouse, there’s a way to be lavish (8)
I believe the answer is:
generous
'be lavish' is the definition.
(I've seen this before)
'in carving grouse there's a way' is the wordplay.
'in' is an insertion indicator.
'carving' indicates anagramming the letters.
'there's' becomes 'n' (I've seen this in other clues).
'a way' becomes 'e' (Compass direction - East).
'grouse' with letters rearranged gives 'gerous'.
'n'+'e'='ne'
'gerous' enclosing 'ne' is 'GENEROUS'.
'to' is the link.
(Other definitions for generous that I've seen before include "Benevolent, big-hearted" , "Kind towards others" , "Handsome" , "Willing to give unstintingly" , "Bountiful, unselfish" .)