Snake is supple wearing skin of silver (7)
I believe the answer is:
slither
'snake' is the definition.
(thesaurus)
'supple wearing skin of silver' is the wordplay.
'supple' becomes 'lithe' ('lithe' can be a synonym of 'supple').
'wearing' is an insertion indicator.
'skin of' says to hollow out the word (remove centre letters).
'silver' with its centre taken out is 'sr'.
'lithe' inserted into 'sr' is 'SLITHER'.
'is' acts as a link.
(Other definitions for slither that I've seen before include "Snake along" , "Slide unsteadily" , "Slide on slippery surface" , "Quietly advance" , "Move like a snake" .)