Praise a champion racing driver (5)
I believe the answer is:
lauda
'champion racing driver' is the definition.
(F1 driver Niki Lauda)
'praise a' is the wordplay.
'praise' becomes 'laud' (lauding is a kind of praising).
'laud'+'a'='LAUDA'
(Other definitions for lauda that I've seen before include "racing legend" , "Old driver" , "racing driver" .)