Sounding agreeable, doctor covers tips for lumbago (7)
I believe the answer is:
melodic
'sounding agreeable' is the definition.
(melodic means sounding pleasant)
'doctor covers tips for lumbago' is the wordplay.
'doctor' becomes 'medic' (I've seen this before).
'covers' is an insertion indicator.
'tips for' says to hollow out the word (remove centre letters) (only the tips of the word remain).
'lumbago' with its middle taken out is 'lo'.
'medic' enclosing 'lo' is 'MELODIC'.
(Other definitions for melodic that I've seen before include "Old mice (anag.)" , "Pleasant-sounding" , "Pleasant to listen to" , "Pleasant-sound" , "Harmonious" .)