Harass a camper? Hair oil goes back in it (8)

I believe the answer is:

macassar

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'it' is the definition.
The definition suggests a singular noun which matches the answer.

'harass a camper? hair oil goes back' is the wordplay.
'MACASSAR' is hidden back-to-front within the letters.
However, I'm unsure how this is indicated.

'in' is the link.

Can you help me to learn more?

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

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