Crossword Genius

Brew ale with subtle colour (5-4)

Ross

I believe the answer is:

slate-blue

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'colour' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'brew ale with subtle' is the wordplay.
'brew' indicates an anagram.
'with' means one lot of letters go next to another.
'ale' after 'subtle' is 'subtleale'.
'subtleale' anagrammed gives 'SLATE-BLUE'.

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I've seen this clue in The Independent.
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