Communicate at high speed (7)

I believe the answer is:

express

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'communicate' is the definition.
(expressing is a kind of communicating)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for express that I've seen before include "Intimate - squeeze out" , "air" , "Squeeze out - speak" , "for a specific purpose?" , "Speak - fast" .)

I've seen this clue in The Mirror.

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