The most common and most likely answer to this crossword clue is the 11 letter word COMPROMISED
I've seen this crossword clue in The Times
C
O
M
P
R
O
M
I
S
E
D
Buddy explains!

The straight part
We know that "Made a deal" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case made a deal = compromised.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does COMPROMISED mean?
COMPROMISED verb- To bind by mutual agreement.
- To adjust and settle by mutual concessions; to compound.
- To find a way between extremes.
- To pledge by some act or declaration; to endanger the life, reputation, etc., of, by some act which can not be recalled; to expose to suspicion.
- To cause impairment of.
- To breach (a security system).
- Having been compromised.