Not completely nude — centrefold’s wearing clothes! (6)
I believe the answer is:
decent
'wearing clothes' is the definition.
('decent' can mean dressed)
'not completely nude centrefold's' is the wordplay.
'not completely' indicates the answer is hidden within the clue.
'DECENT' is hidden in the letters of 'nude centrefold'.
(Other definitions for decent that I've seen before include "reasonable" , "Adequately covered" , "Generous or modest" , "Generous and modestly clothed" , "Generally acceptable" .)