Support offered by PR in nude wrestling (8)
I believe the answer is:
underpin
'support' is the definition.
(I know that support can be written as underpin)
'pr in nude wrestling' is the wordplay.
'wrestling' indicates anagramming the letters.
'pr'+'in'+'nude'='prinnude'
'prinnude' anagrammed gives 'UNDERPIN'.
'offered by' acts as a link.
(Other definitions for underpin that I've seen before include "corroborate" , "Prop up with nun pride" , "buttress" , "Support or strengthen from beneath" , "Form the basis for" .)