Blend number 1009 (3)

I believe the answer is:

mix

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This clue could be a double definition.

'blend number' is the first definition.
'mix' can be an answer for 'blend' (synonyms). I'm not certain of the 'number' bit.

'1009' is the second definition.
(MIX is 1009 in Roman numerals )

Can you help me to learn more?

(Other definitions for mix that I've seen before include "= 1,009 (L.)" , "Amalgamate, blend" , "Associate" , "Combine into one" , "Get on" .)

I've seen this clue in the Evening Standard.

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