Fast ships? (5)

I believe the answer is:

fleet

I believe this clue is a double definition.

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

'ships' is the second definition.
(eg a naval fleet)

(Other definitions for fleet that I've seen before include "cars en masse?" , "Navy's ships" , "good turn of speed" , "Group of vehicles operating together, ships say" , "Rapid in movement" .)

I've seen this clue in the Evening Standard, The Globe and Mail, The Guardian and The Mirror.

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