Crossword Genius

Mostly the red variety? (4)

Ross

I believe the answer is:

deer

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'variety?' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

'mostly the red' is the wordplay.
'mostly' becomes 'dee' (I can't explain this - if you can you should give a lot more credence to this answer).
'the red' becomes 'r' (I've seen this in other clues).
'dee'+'r'='DEER'

Can you help me to learn more?

(Other definitions for deer that I've seen before include "Perhaps fallow" , "Ruminant mammal with antlers and hooves" , "See 23" , "Like a power switch" , "The male is a stag" .)

I've seen this clue in the Evening Standard.
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