Do return to tidy around a curiosity (6)
I believe the answer is:
oddity
'a curiosity' is the definition.
(I know that curiosity can be written as oddity)
'do return to tidy around' is the wordplay.
'return' shows that the letters should be reversed in order.
'to' is a charade indicator (letters next to each other).
'around' indicates anagramming the letters.
'do' backwards is 'od'.
'tidy' anagrammed gives 'dity'.
'od'+'dity'='ODDITY'
(Other definitions for oddity that I've seen before include "Unusual thing" , "Twelve months" , "Curio, rarity" , "Quirk" , "Toy did (anag.)" .)