Crossword Genius

Proper cost confused one looking for something precious (10)

Ross

I believe the answer is:

prospector

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'one looking for something precious' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'proper cost confused' is the wordplay.
'confused' indicates an anagram.
'proper'+'cost'='propercost'
'propercost' anagrammed gives 'PROSPECTOR'.

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(Other definitions for prospector that I've seen before include "Gold-digger" , "Searcher for minerals" , "Clementine's father, perhaps?" , "One searching for valuable minerals" , "Searcher after valuable ores" .)

I've seen this clue in The Telegraph.
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