Badly review American revolutionary’s flair (7)
I believe the answer is:
panache
'flair' is the definition.
(synonyms)
'badly review american revolutionary's' is the wordplay.
'badly review' becomes 'pan' (I can't justify this - if you can you should give a lot more credence to this answer).
'american' becomes 'a' (common abbreviation - e.g. in organisation names).
'revolutionary' becomes 'che' (Che Guevara the Marxist revolutionary).
'pan'+'a'+'che'='PANACHE'
Can you help me to learn more?
(Other definitions for panache that I've seen before include "Great style" , "Flamboyant sense of style" , "Dash and verve" , "Swagger; theatricality" , "Style, elan" .)