The acre ploughed up remains a measure of area (7)

I believe the answer is:

hectare

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'a measure of area' is the definition.
(I've seen this before)

'the acre ploughed up' is the wordplay.
'ploughed up' indicates anagramming the letters.
'the'+'acre'='theacre'
'theacre' is an anagram of 'HECTARE'.

'remains' is the link.
I am not very happy about this link. It may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for hectare that I've seen before include "Teacher of metric land measure" , "Metric unit of area" , "Extent" , "10,000 squaer metres" , "Metric measure of area" .)

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

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