Vigorous, I shake the talc around (8)
I believe the answer is:
athletic
'vigorous' is the definition.
(I've seen this before)
'i shake the talc around' is the wordplay.
'shake' indicates an anagram.
'around' indicates putting letters inside.
'the'+'talc'='thetalc'
'thetalc' is an anagram of 'athletc'.
'i' going within 'athletc' is 'ATHLETIC'.
(Other definitions for athletic that I've seen before include "Wigan, for example" , "See 12" , "Sporty, able-bodied" , "Fit and sporty" , "Team" .)