Deputy fools around outside also (7)

'deputy' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'fools around outside also' is the wordplay.
'fools' becomes 'nits' (I've seen this before).
'around' says the letters should be written backwards.
'outside' indicates putting letters inside (some letters go outside others).
'also' becomes 'and' (both can mean in addition).
'nits' reversed gives 'stin'.
'stin' going around 'and' is 'STANDIN'.

Can you help me to learn more?