Crossword Genius

Post office worker admits second-rate, shoddy work (9)

Ross

I believe the answer is:

potboiler

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

'shoddy work' is the definition.
'potboiler' can be an answer for 'work' (I have seen 'hasty work' mean 'potboiler' so perhaps 'work' could also mean 'potboiler'). I am not certain of the 'shoddy' bit.

'post office worker admits second-rate' is the wordplay.
'post office' becomes 'po' (abbreviation).
'worker' becomes 'toiler' (toiler is a kind of worker).
'admits' indicates putting letters inside (to admit is to allow in).
'second rate' becomes 'b'.
'toiler' enclosing 'b' is 'tboiler'.
'po'+'tboiler'='POTBOILER'

Can you help me to learn more?

(Other definitions for potboiler that I've seen before include "Money-making book" , "likely to be steamy?" , "Book, film, etc, produced just for the money" , "Book of little merit written to make a quick profit" , "Book written just for the money" .)

I've seen this clue in The Independent.
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