Thanks to these vessels, business flowers (8)

I believe the answer is:

coasters

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'thanks to these vessels' is the definition.
The definition suggests an adverb but the answer is not.

'business flowers' is the wordplay.
'business' becomes 'co' (short for company).
'flowers' becomes 'asters' (aster is a type of flower).
'co'+'asters'='COASTERS'

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(Other definitions for coasters that I've seen before include "Small table-mats" , "Small mats for Socrates" , "Merchant ships with a limited range of operation" .)

I've seen this clue in the Evening Standard.

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