Flexible time for musicians (6)
I believe the answer is:
'flexible time' is the definition.
'rubato' can be an answer for 'time' (thesaurus). I am not sure about the 'flexible' bit.
'for musicians' is the wordplay.
I cannot quite understand how this works, but
'for' could be 'to' (eg both can mean 'in the opinion of') and 'to' is located in 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 rubato that I've seen before include "playing erratically?" , "played with freedom" , "time variation" , "Temporary deviation from strict tempo" , "Deviation from tempo (music), or tuba (anag.)" .)