The most common and most likely answer to this crossword clue is the 4 letter word SWAP
S
W
A
P
More clues leading to the result SWAP
- Substitute seen putting feet up
- Switch feet from right to left
- Change hands over
- Exchange boggy area after losing a bit of money
- Switch hands back
- Hands over in exchange
- Commute, hands raised
- Son beginning to worry about part exchange
- Starts to worry about profits after opening of stock exchange
- Exchange airless Wapping houses
Buddy explains!

The straight part
We know that "Switch" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case switch = swap.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 SWAP mean?
SWAP verb- To exchange or give (something) in an exchange (for something else).
- To hit, to strike.
- To beat the air, or ply the wings, with a sweeping motion or noise; to flap.
- To descend or fall; to rush hastily or violently.
- An exchange of two comparable things.
- A financial derivative in which two parties agree to exchange one stream of cashflow against another stream.
- Space available in a swap file for use as auxiliary memory.
- A blow; a stroke.