Can sex put back touch of naughtiness? (3)
I believe the answer is:
tin
'can' is the definition.
(both are metal containers)
'sex put back touch of naughtiness?' is the wordplay.
'sex' becomes 'it' (a common euphemism).
'put back' is a reversal indicator.
'touch of' indicates taking the first letters.
The initial letter of 'naughtiness' is 'n'.
'it' back-to-front is 'ti'.
'ti'+'n'='TIN'
(Other definitions for tin that I've seen before include "Money" , "Metal in Argentina" , "Ready" , "roofing material" , "Kind of metal often used as food container" .)