Crossword Genius

Collier finds a large rock (7)

Ross

I believe the answer is:

mineral

'rock' is the definition.

'collier finds a large' is the wordplay.
'collier' becomes 'miner' (I've seen this in another clue).
'finds' is a charade indicator (letters next to each other).
'large' becomes 'L' (eg in clothes sizes).
'miner'+'a'+'l'='MINERAL'

(Other definitions for mineral that I've seen before include "Such as 1 dn" , "Neither animal nor vegetable" , "Substance needed for health; ore" , "Substance that is (usually) inorganic" , "Gypsum or magnesia, say" .)

I've seen this clue in The Mirror.
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