Quietly steal around two mushrooms (8)
I believe the answer is:
shiitake
'quietly steal around two mushrooms' is the definition.
I can't tell whether this defines the answer.
'quietly steal around two' is the wordplay.
'quietly' becomes 'sh' (both are used to tell someone to be quiet).
'steal' becomes 'take' (to steal is to take without permission).
'around' is an insertion indicator.
'two' becomes 'II' (Roman numerals).
'sh'+'take'='shtake'
'shtake' enclosing 'ii' is 'SHIITAKE'.
Can you help me to learn more?
(Another definition for shiitake that I've seen is " Type of mushroom".)