Collier has a right to be a sailor (7)
I believe the answer is:
mariner
'be a sailor' is the definition.
(I've seen this before)
'collier has a right' is the wordplay.
'collier' becomes 'miner' (I've seen this before).
'has' indicates putting letters inside.
'a right' becomes 'ar' (I've seen this in other clues).
'miner' enclosing 'ar' is 'MARINER'.
'to' acts as a link.
(Other definitions for mariner that I've seen before include "'''The Rime of the Ancient ...'' (Coleridge) (7)'" , "Sea-goer, ancient in the poem" , "collier?" , "Man of the sea" , "See 13" .)