Awful bloomer, Frenchman leaving jacket (6)
I believe the answer is:
bolero
'jacket' is the definition.
(bolero is a kind of jacket)
'awful bloomer frenchman leaving' is the wordplay.
'awful' indicates an anagram.
'frenchman' becomes 'm' (abbreviation for Monsieur - like 'Mr').
'leaving' indicates named letters should be taken away.
'bloomer' with 'm' removed is 'blooer'.
'blooer' is an anagram of 'BOLERO'.
(Other definitions for bolero that I've seen before include "Dance (by Ravel?)" , "Maurice Ravel's most famous work" , "Genre of slow-tempo Latin music associated with Spain and Cuba" , "Short jacket or music by Ravel" , "short jacket is required here" .)