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8 Across, Entitling one to return,if note is retained,jewellery (9)

10 Across, Performed revolutionary tune that's found in Spanish bars (7)

11 Across, Got involved,and won prize in audition (7)

12 Across, Tests rate limits under duress (4,6)

Many thanks

10 performed - sang
revolutionary tune - ria (air)

sangria (Spanish wine)

10 sang ria

11 meddled (sounds like medalled )

12 time trials - anagram

8 ennobling
10 sangria
11 meddled
12 time trials

parsing ?

8 one (reversed) n (note) + bling (jewellery)

One reversed with (n) inside + bling (jewellery)
Defn entitling

Good Morning and many thanks to you all.