Prohibited sort of beard (7)
I believe the answer is:
forbade
'prohibited' is the definition.
(I've seen this before)
'sort of beard' is the wordplay.
'sort' indicates anagramming the letters.
'of'+'beard'='ofbeard'
'ofbeard' anagrammed gives 'FORBADE'.
(Other definitions for forbade that I've seen before include "Disallowed" , "Prohibited" , "banned" , "Vetoed" .)