Exclude for having a matted beard? (5)

I believe the answer is:

debar

I'm a little stuck... Click here to teach me more about this clue!

'exclude' is the definition.
(I know that exclude can be written as debar)

'having a matted beard?' is the wordplay.
'beard' anagrams to 'DEBAR'.
However, I am unsure how this is indicated.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for debar that I've seen before include "Refuse to admit" , "Exclude from a place" , "Exclude - bread (anag)" , "Exclude (from doing something)" , "Formally prevent" .)

I've seen this clue in the Evening Standard.

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