Queen's thing is to roll back amount by one hundred (4,5)
I believe the answer is:
rock music
'queen's thing' is the definition.
(Queen are a rock band)
'roll back amount by one hundred' is the wordplay.
I cannot quite see how this works, but
'amount' could be 'km' (km is a kind of amount) and 'km' is located in the answer.
'one' could be 'i' (Roman numeral) and 'i' is present in the answer.
'hundred' could be 'c' (Roman numeral) and 'c' is located in the answer.
This explanation may well be incorrect...
'is to' is the link.
Can you help me to learn more?
(Other definitions for rock music that I've seen before include "sound of the sirens?" , "Popular entertainment" , "Sound with a strong beat" , "Largely guitar-based genre" .)