Boxers perhaps disorientated -- dare we run? (9)
I believe the answer is:
underwear
'boxers perhaps' is the definition.
(I know that boxer shorts is a underwear)
'disorientated dare we run?' is the wordplay.
'disorientated' indicates an anagram.
'dare'+'we'+'run'='darewerun'
'darewerun' anagrammed gives 'UNDERWEAR'.
(Other definitions for underwear that I've seen before include "Vest, pants etc" , "Hidden clothing" , "Vests, knickers etc" , "Garments worn next to the skin" , "Garments worn beneath other clothes" .)