Crossword Genius

Work a large stone (4)

Ross

I believe the answer is:

opal

'stone' is the definition.
(thesaurus)

'work a large' is the wordplay.
'work' becomes 'op' (abbreviation for opus**).
'large' becomes 'l'.
'op'+'a'+'l'='OPAL'

(Other definitions for opal that I've seen before include "Semi-precious stone of milky or bluish colour" , "Semi-precious stone of b;uish white colour" , "Variegated gemstone" , "Milky-white gemstone with flashes of colour" , "Something milky-white" .)

I've seen this clue in The Telegraph.
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