This is for the 91-96 Clio 16-Valve:
The cars are fairly maintenace-intensive, but, as ever, the care it has received thus far will usually dictate condition. Look for a big folder of bills.
What you should then be looking for then can be split into categories:
Exterior: Rear arch lips are susceptible to rusting, front ones are plastic so arent a problem; rust also possible on door bottoms, around window rear quarters and boot bottom; front fogs (expensive) are prone to splitting due to stone chips; bonnet and front bumper also prone to stone chips.
Mechanical: N.B. due to engine size, many otherwise simple jobs on 16v/Willy are engine-out jobs. Cambelts must have been done before 72k; diffs, gbox and clutch are all expensive jobs so check carefully; rear brake callipers can seize; check aftermarket exhaust mountings - often a poor fit; rumbling can be caused by poor exhaust manifold to downpipe gasket (cheap job, disturbing noise); erratic idle commonly due to faulty throttle potentionometer; 16v/Willy run hot, so check coolant system - hoses, rad, expansion tank, water pump, anti-percolation (if you can); engine mounts often go - embarassing and expensive to have your engine fall out, so see if engine rocks back and forth by opening bonnet and pulling accelerator cable; if car has induction kit check security of air hoses; check for snapped front springs; CV gaiters should be checked; handbrake is normally not good; if lowered, will need new front strut top mounts sooner or later.
Interior: Sunroofs leak; electic window switches are £20 - so check them too.