Crossword Genius

Because of fast talk! (3)


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'because' is the definition.
(short for 'because')

I don't understand the rest of the clue.

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(Other definitions for cos that I've seen before include "Casual as" , "holiday destination" , "providing unsatisfactory explanation?" , "foreign island" , "Lettuce with long crisp leaves" .)

I've seen this clue in the Evening Standard.
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