Isn't able to tolerate changing key for learner in singing piece (9)
I believe the answer is:
cantabile
'singing piece' is the definition.
'cantabile' can be an answer for 'singing' (I've seen this before). I'm not sure about the 'piece' bit.
'isn't able to tolerate changing key for learner' is the wordplay.
I cannot quite understand how this works, but
'able' could be 'can' and 'can' is found within the answer.
'key' could be 'e' (musical key) and 'e' is found in the answer.
'learner' could be 'l' (as in a learner driver with L-plates on their car) and 'l' is found in the answer.
The remaining letters 'tabi' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'in' acts as a link.
Can you help me to learn more?
(Other definitions for cantabile that I've seen before include "In a smooth singing style - balance it (anag)" , "(Of music) in a smooth singing style" , "Like singing" , "Melodious, as in singing - balance it (anag)" , "Mellifluous" .)