Wild unclothed period (3)
I believe the answer is:
era
'period' is the definition.
(era is a kind of period)
'wild unclothed' is the wordplay.
'wild' becomes 'feral' (similar in meaning).
'unclothed' says to take the centre.
The central letters of 'feral' are 'ERA'.
(Other definitions for era that I've seen before include "Memorable period" , "Stage" , "Age marked by a distinctive character" , "Characteristic period" , "Important date" .)