Rapid, speedy (4)

I believe the answer is:

fast

This clue is a double definition.

'rapid' is the first definition.
(similar in meaning)

'speedy' is the second definition.
(similar in meaning)

(Other definitions for fast that I've seen before include "Unable to move" , "Secure; speedy" , "not lento" , "Lent, perhaps" , "Accelerated" .)

I've seen this clue in The Times.

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