I couldn't find it mentioned so I've emailed them. As you know we book with www.doyouspain.com regularly & we are normally given http://www.aurigacrown.com/ I've looked on Auriga's website & true enough I saw this..
http://www.aurigacrown.com/condiciones-generales.jsp
The rental price does not include:clutch (due to misuse), lost or broken keys, error of fuel and costs involved, (you can acquire an additional insurance at € 20 per rental contract in order to cover the damages caused to glass, wheels and clutch).
I've not seen clutch not covered with other car hire firms though I've not gone into it as we use Auriga.
I see Record at Alicante say http://www.recordrentacar.com/car_hire/airport_condiciones.htm
The insurance does not cover the following ( amongst other things we would normally see)
- Damage to the engine due to negligence.
- Misuse of the clutch.
Amazing what we aren't aware of, don't you think ?