Disappointed heir ends date explosively (12)

I believe the answer is:

disheartened

'disappointed' is the definition.
(thesaurus)

'heir ends date explosively' is the wordplay.
'explosively' indicates anagramming the letters.
'heir'+'ends'+'date'='heirendsdate'
'heirendsdate' with letters rearranged gives 'DISHEARTENED'.

(Other definitions for disheartened that I've seen before include "Discouraged" , "Having lost determination or confidence" , "Crestfallen" , "Despondent" , "Upset; downcast" .)

I've seen this clue in The Times.

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