Using free ticket, others picked up song that could be Under Pressure (10,3)
I believe the answer is:
compressed air
'be under pressure' is the definition.
The definition and answer can be both substances as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'using free ticket others picked up song that' is the wordplay.
I cannot quite see how this works, but
'song' could be 'air' (air can mean a piece of music) and 'air' is located in the answer.
'free ticket' could be 'comp' (a complimentary ticket) and 'comp' is found within the answer.
This explanation may well be incorrect...
'could' is the link.
Can you help me to learn more?
(Other definitions for compressed air that I've seen before include "Something provided on garage forecourt" , "Tyre filler" , "that's piped" , "Filler for tyres" .)