Turn cosy with story to tell, one providing musketeers? (8)
I believe the answer is:
gunsmith
'one providing musketeers?' is the definition.
(someone making guns)
'turn cosy with story to tell' is the wordplay.
'turn' says the letters should be written backwards.
'cosy' becomes 'snug' (synonyms).
'with' says to put letters next to each other.
'story' becomes 'myth' (myth is a kind of story).
'to tell' shows a homophone (sound like) (I've seen 'told' mean this).
'myth' sounds like 'mith'.
'snug' in reverse letter order is 'guns'.
'guns'+'mith'='GUNSMITH'
(Other definitions for gunsmith that I've seen before include "Maker of firearms" , "Arms maker" , "arms dealer" , "Weapons maker" , "I can arm you" .)