Well, I've just finished this rascal and have to say, great clues, however, I'm missing something on two clues if anyone can put me right with the wordplay.
54a) Advanced, as was rival denied one after returning prize? (7)
I have E - O - V - D
I feel it must be 'Evolved' (advanced)
as was rival (vied) ? denied one (minus i) v(i)ed
after returning prize - Evol - love?
Don't get the 'Love' ref
10d) Art worthy of being serious (7)
I have E - R - E - T
Must be 'Earnest' = Serious?
Explanation welcome
Cheers Les40