Cut second thigh off game bird and left replacement there - that's nice (8)
I believe the answer is:
pleasant
'nice' is the definition.
(associated in meaning)
'cut second thigh off game bird and left replacement there' is the wordplay.
I cannot quite understand how this works, but
'second' could be 's' (common abbreviation) and 's' is found in the answer.
'game' could be 'p' (I have seen 'French game ' mean 'p' so perhaps 'game' could also mean 'p') and 'p' is located in the answer.
'bird' could be 'ant' (ant bird is a kind of bird) and 'ant' is found within the answer.
'left' could be 'l' (common abbreviation) and 'l' is found within the answer.
The remaining letters 'ea' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'that's' acts as a link.
Can you help me to learn more?
(Other definitions for pleasant that I've seen before include "Satisfying, likeable" , "Lovely" , "Refreshing" , "Enjoyable, agreeable" , "A greeable, affable" .)