Like devoted fans of Sting in a circle (7)

I believe the answer is:

adoring

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'like devoted fans' is the definition.
(I've seen this in another clue)

'of sting in a circle' is the wordplay.
'of sting' becomes 'do' (I can't explain this - if you can you should give a lot more credence to this answer).
'in' indicates putting letters inside.
'circle' becomes 'ring' (synonyms).
'a'+'ring'='aring'
'do' going within 'aring' is 'ADORING'.

Can you help me to learn more?

(Other definitions for adoring that I've seen before include "Extravagantly indulgent" , "Devoted" , "Worshipping; admiring" , "Loving deeply" , "Really getting into" .)

I've seen this clue in The Independent.

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