Crossword Genius

And goes through these strange mountains

Ross

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3,5

8*

theandes

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'mountains' is the definition.
Although both the answer and definition are nouns, they are not in the same form of the noun.

'and goes through these strange' is the wordplay.
'goes through' is an insertion indicator.
'strange' is an anagram indicator.
'these' with letters rearranged gives 'thees'.
'and' put into 'thees' is 'THE ANDES'.

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I've seen this clue in the Evening Standard.
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