Article, belt, I buckled, nevertheless (6)
I believe the answer is:
albeit
'nevertheless' is the definition.
(thesaurus)
'article belt i buckled' is the wordplay.
'article' becomes 'a' (indefinite article**).
'buckled' indicates anagramming the letters.
'belt'+'i'='belti'
'belti' anagrammed gives 'lbeit'.
'a'+'lbeit'='ALBEIT'
(Other definitions for albeit that I've seen before include "A literary although" , "Although, despite" , "Although, since" , "Although, inasmuch as" , "Conjunction meaning although" .)