Crossword Genius

Account showing pork pie manufacturer's invoice fairly settled, avoiding fine (5,4)

Ross

I believe the answer is:

billy liar

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

'pork pie manufacturer's invoice fairly settled avoiding fine' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'account' is the wordplay.
I cannot really see how this works, but
'account' could be 'bill' (synonyms) and 'bill' is found within the answer.
This explanation may well be incorrect...

'showing' is the link.

Can you help me to learn more?

I've seen this clue in The Times.
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