Fabric close to crease in sail is coming apart (7)
I believe the answer is:
silesia
'fabric' is the definition.
(I know that silesia is a type of fabric)
'close to crease in sail is coming apart' is the wordplay.
'close to' indicates one should take the final letters (the close/ending of).
'in' indicates putting letters inside.
'coming apart' is an anagram indicator (letters broken up).
The final letter of 'crease' is 'e'.
'sail'+'is'='sailis'
'sailis' with letters rearranged gives 'silsia'.
'e' placed within 'silsia' is 'SILESIA'.
(Other definitions for silesia that I've seen before include "Polish area" , "Region of central Europe" , "Central European area" , "European region" , "part of Europe" .)