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A bunch of taxis moving swiftly (5)

Ross

I believe the answer is:

fleet

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'a bunch' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

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(Other definitions for fleet that I've seen before include "good turn of speed" , "Navy - quick" , "Swift like naval force" , "ships, lots of them" , "Fast and nimble" .)

I've seen this clue in The Hindu.
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