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Writer touched rubbish pile by pigsty (4-3,3)

Ross

I believe the answer is:

felt-tip pen

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

'writer' is the definition.
(I've seen this before)

'touched rubbish pile by pigsty' is the wordplay.
'touched rubbish pile' becomes 'felttip' (I can't explain this - if you can you should give a lot more credence to this answer).
'by' means one lot of letters go next to another.
'pigsty' becomes 'pen' (I've seen this in another clue).
'felttip'+'pen'='FELT-TIP PEN'

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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