Crossword Genius

Water colour (4)

Ross

I believe the answer is:

aqua

This clue is a double definition.

'water' is the first definition.
(thesaurus)

'colour' is the second definition.
(aqua is a kind of colour)

(Other definitions for aqua that I've seen before include "Prefix denoting "water"" , "- Regia; - fortis" , "- - Libra" , "-- fortis, 'strong water'" , "Blue tinged with green" .)

I've seen this clue in The Telegraph and The Irish News.
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