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Am stuck in bottom left hand corner. Any help appreciated.
17d Tracked vehicle kept in grounds - no Caterpillar.
I have ?N? C?? I can only come up with ant cow - but can't see how this would be right.
25a Conservationists, aboard mystery tour, set about a task. I have ??R? T?

tur (nt) o = turn to

17. Sno cat - hidden in clue?

Thanks Kiwikid and rogerjw!! Obvious when someone tells you!