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Metric substitute for the acre (7)

Ross

I believe the answer is:

hectare

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

'metric substitute' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

'the acre' is the wordplay.
'the acre' anagrams to 'HECTARE'.
However, I am not sure how the anagram is indicated.

'for' is the link.

Can you help me to learn more?

(Other definitions for hectare that I've seen before include "Amount of ground" , "Some land in France" , "Metric unit of area" , "10,000 square metres" , "10,000 squaer metres" .)

I've seen this clue in The Globe and Mail.
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