How one's brought back to earth in field (15)

I believe the answer is:

gravitationally

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'how' is the definition.
Both the definition and answer are adverbs. Maybe they are linked in a way I don't understand?

'one's brought back to earth in field' is the wordplay.
I cannot really see how this works, but
'field' could be 'gravitational' (gravitational field is a kind of field) and 'gravitational' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Guardian.

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