Crossword Genius

Work with a large gem (4)

Ross

I believe the answer is:

opal

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Here is my best explanation:

'gem' is the definition.
(opal is a kind of gem)

'work with a large' is the wordplay.
'work' becomes 'op' (abbreviation for opus**).
'with' says to put letters next to each other.
'large' becomes 'l'.
'op'+'a'+'l'='OPAL'

Ross

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This clue was last seen in The Times

(Other definitions for opal that I've seen before include "Precious stone", "Stone", "Colour", "Iridescent quartz-like stone", "Birthstone for October", "Milky white gem", "Gemstone mineral", "Jewel", "Gemstone, hydrated silica" and "Opaque mineral used a gemstone".)

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