Louder mention of a racing driver (5)
I believe the answer is:
'racing driver' is the definition.
(I've seen this before)
'louder mention of a' is the wordplay.
'louder mention of' becomes 'laud' (I can't justify this - if you can you should give a lot more credence to this answer).
Can you help me to learn more?
(Other definitions for lauda that I've seen before include "Old driver" , "racing legend" , "racing driver" .)