Hastened to mountain range (3,5)

I believe the answer is:

the andes

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

'range' is the definition.
(I've seen this before)

'hastened to mountain' is the wordplay.
'hastened' anagrams to 'THE ANDES'.
However, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Another definition for the andes that I've seen is " Range".)

I've seen this clue in The Irish Independent.

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