Crossword Genius

Destroyed -- as are double-barrelled names? (6)

Ross

I believe the answer is:

dashed

I'm a little stuck... Click here to teach me more about this clue!

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

'as are double-barrelled names?' is the wordplay.
I cannot quite understand how this works, but
'as' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for dashed that I've seen before include "Moved very quickly or hastily" , "Ran quickly, rushed" , "completely destroyed" , "Threw down or ran fast" , "Ran hastily" .)

I've seen this clue in The Telegraph.
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