Transport provider's melody with lyric (7)
I believe the answer is:
airline
'transport' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's a link between them I don't understand?
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for airline that I've seen before include "Company operating aeroplanes" , "Virgin, possibly" , "Transport organisation" , "Transport business" , "It creates inflation" .)