Crossword Genius

Mass run on maintenance cost (7,6)

Ross

I believe the answer is:

service charge

I'm a little stuck... Click here to teach me more about this clue!

'cost' is the definition.
(service charge is a kind of cost)

'mass run on maintenance' is the wordplay.
'mass run' becomes 'charge' (I am not sure about the 'mass' bit.).
'on' is a charade indicator (letters next to each other).
'maintenance' becomes 'service' (service is a kind of maintenance).
'charge' after 'service' is 'SERVICE CHARGE'.

Can you help me to learn more?

(Other definitions for service charge that I've seen before include "Restaurant bill addition" , "Additional restaurant fee" , "Restaurant bill add-on" , "Restaurant may have one" , "Percentage added to the bill?" .)

I've seen this clue in The Daily Express.
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