The most common and most likely answer to this crossword clue is the 13 letter word SATISFACTIONS
I've seen this crossword clue in The Times
S
A
T
I
S
F
A
C
T
I
O
N
S
Buddy explains!

The straight part
We know that "settlements" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case settlements = satisfactions.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.
Crossword Answer definitions
SATISFACTIONS noun- A fulfilment of a need or desire.
- The pleasure obtained by such fulfillment.
- The source of such gratification.
- A reparation for an injury or loss.
- A vindication for a wrong suffered.