Crossword Genius

Mass of waste paper cut by a composer (7)

Ross

I believe the answer is:

fatberg

'mass of waste' is the definition.
(mass of sewage waste)

'paper cut by a composer' is the wordplay.
'paper' becomes 'ft' (newspaper the FT, Financial Times).
'cut by' means one lot of letters goes inside another.
'composer' becomes 'berg' (20th Century Austrian composer).
'ft' going around 'a' is 'fat'.
'fat'+'berg'='FATBERG'

I've seen this clue in The Guardian.
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