Peevishly complain French article about wine is regressive (6)
I believe the answer is:
snivel
'peevishly complain' is the definition.
(snivel can mean to complain or whinge)
'french article about wine is regressive' is the wordplay.
'french article' becomes 'les' (plural definite article in French).
'about' indicates putting letters inside.
'wine' becomes 'vin' ('wine' in French).
'is regressive' says the letters should be written backwards (to regress is to go backwards).
'les' placed around 'vin' is 'levins'.
'levins' in reverse letter order is 'SNIVEL'.
(Other definitions for snivel that I've seen before include "Complain whiningly" , "Cry in miserable whining way" , "Whimper" , "Sniff - whine" , "Complain self-pityingly" .)