Labour candidate finally producing fine material (5)
I believe the answer is:
toile
'fine material' is the definition.
(type of linen)
'labour candidate finally' is the wordplay.
'labour' becomes 'toil' (synonyms).
'candidate finally' becomes 'e' (I can't justify this - if you can you should believe this answer much more).
'toil'+'e'='TOILE'
'producing' acts as a link.
(Other definitions for toile that I've seen before include "6 [LINEN]" , "cloth" , "Fabric" , "dress material" , "cheap prototype" .)