Rule out bread-making (5)
I believe the answer is:
debar
'rule out' is the definition.
(thesaurus)
'bread-making' is the wordplay.
'making' indicates anagramming the letters.
'bread' anagrammed gives 'DEBAR'.
(Other definitions for debar that I've seen before include "Large advert" , "Prohibit (from doing something)" , "Exclude (from doing something)" , "Keep out" , "Exclude, prohibit" .)