Pathetic complaint backed by the Parisian (6)
I believe the answer is:
feeble
'pathetic' is the definition.
(thesaurus)
'complaint backed by the parisian' is the wordplay.
'complaint' becomes 'beef' (I've seen this before).
'backed' says the letters should be written in reverse.
'by' says to put letters next to each other.
'the parisian' becomes 'le' (definite article in French).
'beef' reversed gives 'feeb'.
'feeb'+'le'='FEEBLE'
(Other definitions for feeble that I've seen before include "lacking resolve" , "Paltry" , "Weak, frail" , "rather weak" , "Weak or Fragile" .)