One employed to unpick seams? (5)
I believe the answer is:
miner
'one' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for miner that I've seen before include "Underground worker" , "One who digs for ore" , "Man of 49" , "Excavator" , "Bevin boy" .)