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A 6 letter 'treeless arctic region is reversed in the clue

5d: The definition is "difficult problem"

If you do not want answers, Barny , it would be as well to make this clear by asking for "hints only"

Thanks Scorpiojo. I was right I am dim today.

You are welcome :-)

Hello Elle. I thought it was in the spirit of this forum not to post answers, only tips.

thank you, that was a good hint

Hi, Barny!
Different people require different responses - it is best to specify if you only wish for a 'hint' rather than a full answer.
Then we know what to offer.....

I have 4A and 7D left but I wonder if I’ve gone wrong somewhere as I have 4 A starting with P, and K as the fifth letter of 7D. I have P? A?T?? For 4A and ??E?K? For 7D. Have I slipped up?

For 4a the definition is artificial.
For 7d the definition is forward.

Cymro, your crossing letters are all fine.