The naked groom breaks nose (6)
I believe the answer is:
hooter
'nose' is the definition.
(hooter is a kind of nose)
'the naked groom breaks' is the wordplay.
'naked' indicates the central letters.
'breaks' indicates anagramming the letters.
The central letters of 'groom' are 'roo'.
'the'+'roo'='theroo'
'theroo' anagrammed gives 'HOOTER'.
(Other definitions for hooter that I've seen before include "Siren, horn; nose" , "It makes a loud noise" , "Uphill stone pusher (Gk. myth)" , "owl?" , "Gnomon" .)