Crossword Genius

When Otto fools around, it lets you put your feet up (9)

Ross

I believe the answer is:

footstool

I'm a little stuck... Click here to teach me more about this clue!

'it lets you put your feet up' is the definition.
The definition suggests a singular noun which matches the answer.

'when otto fools' is the wordplay.
'otto fools' can be anagrammed to 'FOOTSTOOL'.
Though, I am unsure how the anagram is indicated.

'around' acts as a link.

Can you help me to learn more?

(Other definitions for footstool that I've seen before include "piece of furniture" , "Sitter's rest" , "pouffe" , "Low item of furniture" , "small item of furniture" .)

I've seen this clue in the Evening Standard.
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