Cast out bread that's hard (8)
I believe the answer is:
obdurate
'hard' is the definition.
(I've seen this before)
'cast out bread' is the wordplay.
'cast' indicates an anagram (letters are dispersed or cast around).
'out'+'bread'='outbread'
'outbread' is an anagram of 'OBDURATE'.
'that's' is the link.
(Other definitions for obdurate that I've seen before include "Stubbornly resistant" , "Unyielding - cruel" , "Hard-hearted" , "Impervious to persuasion" , "Inflexible" .)