The most common and most likely answer to this crossword clue is the 5 letter word AUGHT
I've seen this crossword clue in Independent
A
U
G
H
T
Buddy explains!

The straight part
We know that "Anything" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case anything = aught.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 AUGHT mean?
AUGHT pronoun- Anything whatsoever, any part.
- Whit, the smallest part, iota.
- Zero
- The digit zero as the decade in years. For example, aught-nine for 1909 or 2009.
- At all, in any degree, in any respect.
- Estimation.
- Of importance or consequence (in the phrase "of aught").
- Esteem, respect.
- Property; possession
- Duty; place; office
- To own, possess
- To owe, be obliged or obligated to
- Possessed of
- A numerical value equal to 8; the number occurring after seven and before nine.
- Describing a group or set with eight elements.