When Otto fools around, it lets you put your feet up (9)
I believe the answer is:
footstool
'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" .)