A slim hot nudist regularly shows nuts (7)
I believe the answer is:
almonds
'nuts' is the definition.
(almond is a kind of nut)
'a slim hot nudist regularly' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'slim'+'hot'+'nudist'='slimhotnudist'
The alternating letters of 'slimhotnudist' are 'lmonds'.
'a'+'lmonds'='ALMONDS'
'shows' acts as a link.
(Other definitions for almonds that I've seen before include "Fruits for marzipan" , "Sold man on kind of nuts" , "Man sold (anag.)" , "Nuts used to make marzipan" .)