Crossword Genius

Thoughtless ace rival shot (8)

Ross

I believe the answer is:

cavalier

'thoughtless' is the definition.
(I've seen this before)

'ace rival shot' is the wordplay.
'shot' indicates an anagram.
'ace'+'rival'='acerival'
'acerival' with letters rearranged gives 'CAVALIER'.

(Other definitions for cavalier that I've seen before include "Shout out noisily" , "Civil War participant" , "English Civil War royalist" , "... King Charles, spaniel" , "Offhand - Charles I supporter" .)

I've seen this clue in The Sun and The Times.
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