Adjusting toe is unlikely to sort a pulling issue. It's still worth doing as a matter of investigation, but ask that the suspension is checked for play before doing any adjustments.
If it pulls strongly to one side, usually something is worn (most likely track rod end or lower arm balljoint). Alternatively the tyres could just be worn unevenly/odd pressure, or something else tyre related.
If all checks out with toe alignment a full geo-check should show up if something in the steering/suspension is bent (you'd know if you'd bent something, so thats unlikely), but as standard only front toe is adjustable.
bear in mind, all cars track with road camber to a greater or lesser degree, moreso with stiff, low profile tyres and/or stiff suspension. Clio's particularly so. It could just be thye crown of the road?