Cut offer by accepting terms in legal promo (10)
I believe the answer is:
tenderloin
'accepting terms in legal promo' is the definition.
I can't judge whether this definition defines the answer.
'cut offer by' is the wordplay.
'cut' becomes 'loin' (cut of meat).
'offer' becomes 'tender' (tender can mean to offer something).
'by' means one lot of letters go next to another.
'loin' put after 'tender' is 'TENDERLOIN'.
Can you help me to learn more?
(Other definitions for tenderloin that I've seen before include "Prime cut of pork, etc" , "best cut" , "Fine cut of meat" , "seedy area of New York" , "soft meat" .)