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Going round and round something or getting your teeth into it? (8)

Ross

I believe the answer is:

orbiting

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

'getting your teeth into it?' is the definition.
I can't tell whether this defines the answer.

'going round and round something' is the wordplay.
'going round' becomes 'ing' (I can't explain this - if you can you should believe this answer much more).
'and' means one lot of letters go next to another (I've seen this in other clues).
'round' becomes 'orb'.
'something' becomes 'it' (I've seen this in other clues).
'orb'+'it'='orbit'
'ing' put after 'orbit' is 'ORBITING'.

'or' is the link.

Can you help me to learn more?

(Other definitions for orbiting that I've seen before include "Going round in circles" , "Moving around a body in space" , "as the moon is?" , "In a kind of revolution" , "Revolving around another object" .)

I've seen this clue in the Sydney Morning Herald.
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