One might take ore fragment from seam in error (5)
I believe the answer is:
miner
'one might take ore fragment' is the definition.
I can't tell whether this definition defines the answer.
'from seam in error' is the wordplay.
'from' indicates a hidden word.
'MINER' can be found hidden inside 'seam in error'.
Can you help me to learn more?
(Other definitions for miner that I've seen before include "Bevin boy" , "Digger for gold or coal, say" , "Man of 49" , "Coal worker" , "One sent down for work" .)