Knock down wanderer holding French article (3,4)
I believe the answer is:
run over
'knock down' is the definition.
(I've seen this before)
'wanderer holding french article' is the wordplay.
'wanderer' becomes 'rover' (synonyms).
'holding' is an insertion indicator.
'french article' becomes 'un' (indefinite article in French).
'rover' going around 'un' is 'RUN OVER'.
(Other definitions for run over that I've seen before include "Hit with a car" , "Knock down and crush with vehicle" , "Knock down (in car)" , "review" , "Take too long" .)