Crossword Genius

Oversure about fields (8)

Ross

I believe the answer is:

pastures

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

'fields' is the definition.
The definition and answer can be both locations as well as being plural nouns.
Maybe you can see an association between them that I don't see?

'oversure about' is the wordplay.
I cannot quite understand how this works, but
'about' could be 're' ('re' means regarding or about) and 're' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for pastures that I've seen before include "Fresh fields and... new." , "Grazing fields" , "Dairy meadows" , "Lands used for grazing" .)

I've seen this clue in The Irish Independent.
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