Long-winded professional figures (6)

I believe the answer is:

prolix

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'long-winded' is the definition.
(similar in meaning)

'professional figures' is the wordplay.
'professional' becomes 'pro' (synonyms).
'figures' becomes 'lix' (I am not sure about this - if you are sure you should believe this answer much more).
'pro'+'lix'='PROLIX'

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

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