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A boundary to open farmland belonging to us (4)

Ross

I believe the answer is:

four

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'a boundary' is the definition.
(type of score in cricket)

'open farmland belonging to us' is the wordplay.
'open farmland' becomes 'f' (I can't justify this - if you can you should believe this answer much more).
'belonging to us' becomes 'our' (I've seen this before).
'f'+'our'='FOUR'

'to' acts as a link.

Can you help me to learn more?

(Other definitions for four that I've seen before include "Number of Eliot Quartets" , "Square root of sixteen" , "teatime?" , "Figure" , "10 cleared of misuse of fortune" .)

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