Crossword Genius

Chess problem I ruminate about (9)

Ross

I believe the answer is:

miniature

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

'chess problem' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'i ruminate about' is the wordplay.
'about' indicates anagramming the letters.
'i'+'ruminate'='iruminate'
'iruminate' anagrammed gives 'MINIATURE'.

Can you help me to learn more?

(Other definitions for miniature that I've seen before include "Putting game" , "Small-scale version" , "Diminutive" , "Of a much smaller size than usual" , "illuminated letter" .)

I've seen this clue in The Independent.
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