Crossword Genius

Bill about a land measure (4)

Ross

I believe the answer is:

acre

Here is my best explanation:

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

'bill about' is the wordplay.
'bill' becomes 'ac'.
'about' becomes 're' (regarding).
'ac'+'re'='ACRE'

This clue was last seen in The Globe and Mail