Crossword Genius

Show disfavour of a matted beard (5)

Ross

I believe the answer is:

debar

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

'show disfavour' is the definition.
The answer and definition can be both to do with social activities as well as being verbs in their base form.
Maybe there's an association between them I don't understand?

'a matted beard' is the wordplay.
'beard' anagrams to 'DEBAR'.
However, I am not clear how this is indicated.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for debar that I've seen before include "Rule out" , "Formally prevent" , "Large advert" , "Blackball" , "Prohibit (from doing something)" .)

I've seen this clue in the Evening Standard.
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