Fine garment cut to disintegrate (8)
I believe the answer is:
fragment
'disintegrate' is the definition.
(thesaurus)
'fine garment cut' is the wordplay.
'fine' becomes 'f' (abbreviation).
'cut' indicates an anagram.
'garment' anagrammed gives 'ragment'.
'f'+'ragment'='FRAGMENT'
'to' is the link.
(Other definitions for fragment that I've seen before include "Particle" , "Incomplete part" , "Small piece" , "Small portion" , "Piece broken off something else" .)