The most common and most likely answer to this crossword clue is the 3 plus 2 letter word SIT IN
I've seen this crossword clue in The Daily Telegraph
S
I
T
I
N
More clues leading to the result SIT IN
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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 SIT IN mean?
SIT IN noun- A peaceful form of protest in which people occupy an area and refuse to leave.
- Designed to be sat in.