Crossword Genius

Diamond found in farmland (7)

Ross

I believe the answer is:

infield

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

'diamond' is the definition.
(I know that diamond can be written as infield)

'in farmland' is the wordplay.
'farmland' becomes 'field' (I can't explain this - if you can you should believe this answer much more).
'in'+'field'='INFIELD'

'found' acts as a link.

Can you help me to learn more?

(Other definitions for infield that I've seen before include "From part of playing area" , "down from fence?" , "Area inside racetrack" , "close to batsman?" .)

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