Crossword Genius

Headless vampire that goes round? (7)

Ross

I believe the answer is:

orbiter

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

'headless vampire that goes' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'round?' is the wordplay.
I cannot really understand how this works, but
'round?' could be 'orbit' (I've seen this before) and 'orbit' is found in the answer.
The remaining letters 'er' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for orbiter that I've seen before include "Satellite perhaps" , "Circling spacecraft" , "Space vehicle" , "One goes round" , "Craft going round planet" .)

I've seen this clue in The Sun.
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