Crossword Genius

Nasty thirteen abash me simultaneously (2,3,4,6)

Ross

I believe the answer is:

in the same breath

'simultaneously' is the definition.
(I've seen this in another clue)

'nasty thirteen abash me' is the wordplay.
'nasty' is an anagram indicator.
'thirteen'+'abash'+'me'='thirteenabashme'
'thirteenabashme' anagrammed gives 'IN THE SAME BREATH'.

(Other definitions for in the same breath that I've seen before include "needing no further inspiration?" , "with a single blow?" , "Without breaking off" , "Together" .)

I've seen this clue in the Sydney Morning Herald.
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