Situation in travelling show, including naughty men's act (13)
I believe the answer is:
circumstances
'situation' is the definition.
(thesaurus)
'travelling show including naughty men's act' is the wordplay.
'travelling show' becomes 'circus' (I've seen this before).
'including' means one lot of letters goes inside another.
'naughty' indicates an anagram.
'mens'+'act'='mensact'
'mensact' anagrammed gives 'mstance'.
'circus' going around 'mstance' is 'CIRCUMSTANCES'.
'in' acts as a link.
(Other definitions for circumstances that I've seen before include "One's current state of financial or material welfare" , "Everything that happens to one in life!" , "Details" .)