Nursed tenor, say, holding a note (7)
I believe the answer is:
treated
'nursed' is the definition.
(I've seen this before)
'tenor say holding a note' is the wordplay.
'tenor say' becomes 'tread' (I can't justify this - if you can you should believe this answer much more).
'holding' means one lot of letters goes inside another.
'a note' becomes 'te' (musical note as in do re mi fa so la ti).
'tread' enclosing 'te' is 'TREATED'.
Can you help me to learn more?
(Other definitions for treated that I've seen before include "Dealt with" , "taken out" , "not asked to pay" , "given therapy" , "Attended to" .)