Crossword Genius

A lot of land gives power re the number of years (7)

Ross

I believe the answer is:

acreage

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

'a lot of land' is the definition.
I can't tell whether this defines the answer.

'power re the number of years' is the wordplay.
'power' becomes 'AC' (AC is an example).
'the number of years' becomes 'age'.
'ac'+'re'+'age'='ACREAGE'

'gives' is the link.

Can you help me to learn more?

(Other definitions for acreage that I've seen before include "Extent of ground" , "plot" , "Measure of land" , "Area measure" , "expanse" .)

I've seen this clue in the Sydney Morning Herald.
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