The most common and most likely answer to this crossword clue is the 7 letter word MATCHED
I've seen this crossword clue in The Guardian
M
A
T
C
H
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D
Buddy explains!

The straight part
We know that "suited" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case suited = matched.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 MATCHED mean?
MATCHED verb- To agree; to be equal; to correspond.
- To agree with; to be equal to; to correspond to.
- To make a successful match or pairing.
- To equal or exceed in achievement.
- To unite in marriage, to mate.
- To fit together, or make suitable for fitting together; specifically, to furnish with a tongue and groove at the edges.
- Short for matched grip.