No amateur figures to be long-winded (6)
I believe the answer is:
prolix
'be long-winded' is the definition.
(similar in meaning)
'no amateur figures' is the wordplay.
'no amateur' becomes 'pro' (I've seen this in another clue).
'figures' becomes 'lix' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'pro'+'lix'='PROLIX'
'to' acts as a link.
Can you help me to learn more?
(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" .)