Searcher for minerals (10)
I believe the answer is:
prospector
'searcher for minerals' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for prospector that I've seen before include "Clementine's father, perhaps?" , "One searching for valuable minerals" , "Searcher for minerals" , "Searcher after valuable ores" , "Gold-digger" .)