Peru turned out to be refreshing (4)

I believe the answer is:

pure

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'refreshing' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?

'peru turned out' is the wordplay.
'turned out' indicates anagramming the letters.
'peru' with letters rearranged gives 'PURE'.

'to be' acts as a link.

Can you help me to learn more?

(Other definitions for pure that I've seen before include "Chaste" , "Unalloyed" , "Innocent; unsullied" , "Innocent; not mixed" , "Unadulterated" .)

I've seen this clue in The Mirror.

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