Pay the price for singing intro on record, as it has a pace that's ridiculously hard to maintain (8)
I believe the answer is:
footslog
'record as it has a pace that's ridiculously hard to maintain' is the definition.
I can't tell whether this definition defines the answer.
'pay the price for singing intro' is the wordplay.
'pay' becomes 'foot' (as in footing the bill).
'the price' becomes 'log' (I can't justify this - if you can you should believe this answer much more).
'for' says to put letters next to each other (I've seen this in other clues).
'intro' suggests taking the first letters.
The first letter of 'singing' is 's'.
'log' after 's' is 'slog'.
'foot'+'slog'='FOOTSLOG'
'on' is the link.
Can you help me to learn more?
(Other definitions for footslog that I've seen before include "Long and exhausting march" , "exhausting hike" , "Tramp" , "Long exhausting walk" , "what soldier does" .)