Fair enough in Oz but mind out back in UK (6)

I believe the answer is:

dinkum

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

'back in uk' is the definition.
The definition suggests an adjective which matches the answer.

'fair enough in oz but mind' is the wordplay.
I cannot really understand how this works, but
'in' is present in the answer.
This explanation may well be incorrect...

'out' is the link.

Can you help me to learn more?

(Other definitions for dinkum that I've seen before include "True Australian" , "Genuine [STRINE]" .)

I've seen this clue in The Globe and Mail.

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