Outlaw dared pose in disguise (9)
I believe the answer is:
desperado
'outlaw' is the definition.
(desperado is a kind of outlaw)
'dared pose in disguise' is the wordplay.
'in disguise' indicates an anagram.
'dared'+'pose'='daredpose'
'daredpose' anagrammed gives 'DESPERADO'.
(Other definitions for desperado that I've seen before include "Reckless outlaw" , "reckless type" , "Bravo" , "Bandit, outlaw" , "reckless one" .)