No matter who (6)

I believe the answer is:

anyone

'no matter who' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for anyone that I've seen before include "Nobody specified" , "A person in general" , "An unspecified person or persons" , "A random person" , "Whosoever" .)

I've seen this clue in The Guardian.

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