Master playing Largo No. 2 in the middle of the evening (8)
I believe the answer is:
original
'master' is the definition.
(I know that master can be written as original)
'playing largo no 2 in the middle of the evening' is the wordplay.
I cannot quite see how this works, but
'playing' could be 'in' and 'in' is found in the answer.
'no' could be 'o' (resembles 0 - 'no' can mean 'zero') and 'o' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for original that I've seen before include "Archetype, master copy" , "Eccentric" , "Prototype" , "In first form" , "- - sin" .)