No amateur figures to be long-winded (6)

I believe the answer is:

prolix

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'be long-winded' is the definition.
('prolix' can be similar in meaning to 'long-winded')

I don't understand the remainder of the clue.

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(Other definitions for prolix that I've seen before include "Long and wordy" , "Tediously wordy, talks too much" , "Wordy, long-winded" , "Tediously wordy and lengthy" , "Tediously verbose" .)

I've seen this clue in the Evening Standard.

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