Endless petanque playing on a road or avenue (9)
I believe the answer is:
boulevard
'avenue' is the definition.
(synonyms)
'endless petanque playing on a road' is the wordplay.
'endless' means to remove the last letter.
'petanque' becomes 'boules' (I've seen this before).
'playing on' becomes 'va' (I can't explain this - if you can you should believe this answer much more).
'a road' becomes 'rd' (abbreviation for road).
'boules' with its last letter taken off is 'boule'.
'boule'+'va'+'rd'='BOULEVARD'
'or' is the link.
Can you help me to learn more?
(Other definitions for boulevard that I've seen before include "tree-lined road" , "Wide French thoroughfare" , "Wide tree-lined street" , "Broad tree-lined street" , "Broad urban road" .)