The most common and most likely answer to this crossword clue is the 7 plus 3 letter word PENSION OFF
I've seen this crossword clue in Financial Times
P
E
N
S
I
O
N
O
F
F
More clues leading to the result PENSION OFF
Buddy explains!
The straight part
We know that "to retire with deal" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case to retire with deal = pension off.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.