So tiny, I ruminate sadly (9)

I believe the answer is:

miniature

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'so tiny' is the definition.
'miniature' can be an answer for 'tiny' (thesaurus). I am not sure about the 'so' bit.

'i ruminate sadly' is the wordplay.
'sadly' is an anagram indicator.
'i'+'ruminate'='iruminate'
'iruminate' anagrammed gives 'MINIATURE'.

Can you help me to learn more?

(Other definitions for miniature that I've seen before include "Smaller than normal" , "Tiny copy or very small version" , "illuminated letter" , "Diminutive" , "Putting game" .)

I've seen this clue in The Times.

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