The most common and most likely answer to this crossword clue is the 6 letter word SCOURS
I've seen this crossword clue in The Guardian
S
C
O
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More clues leading to the result SCOURS
Buddy explains!

The straight part
We know that "searches" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case searches = scours.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 SCOURS mean?
SCOURS verb- To clean, polish, or wash something by rubbing and scrubbing it vigorously, frequently with an abrasive or cleaning agent.
- To remove debris and dirt by purging; to sweep along or off (by a current of water).
- To clear the digestive tract by administering medication that induces defecation or vomiting; to purge.
- To (cause livestock to) suffer from diarrhoea or dysentery.
- To cleanse (without rubbing).
- To search an area thoroughly.
- To run with speed; to scurry.
- To move swiftly over; to brush along.
- Diarrhea in horses and cattle caused by intestinal infection.
- A place where wool was washed and cleaned.