Speak fast (7)

I believe the answer is:

express

I believe this clue is a double definition.

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

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

(Other definitions for express that I've seen before include "Convey; particular; train" , "special delivery" , "Utter - non-stop" , "Speak - fast" , "Train; utter" .)

I've seen this clue in The Times, The Guardian and The Telegraph.

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