Harry, Liam, Louis, Niall and Zayn initially await G&T mid song (8,7)
I believe the answer is:
waltzing matilda
'song' is the definition.
(I've seen this before)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for waltzing matilda that I've seen before include "a bundle and going the rounds?" , "Song" , "moving a pack of travellers down under" , "Australian dancing girl" , "Oz ditty" .)