Is "jam in roly-poly" a form of worship? (7)

I believe the answer is:

jainism

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'worship?' is the definition.
The definition and answer can be both related to thinking as well as being singular nouns.
Maybe you can see an association between them that I can't see?

'is jam in roly-poly a form' is the wordplay.
'is jam in' anagrams to 'JAINISM'.
Though, I am unsure how the anagram is indicated.

'of' acts as a link.

Can you help me to learn more?

I've seen this clue in The Independent.

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