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Companion and I about to stop Gypsy reading palms (10)

Ross

I believe the answer is:

chiromancy

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'companion' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'and i about to stop gypsy reading palms' is the wordplay.
I cannot quite understand how this works, but
'and' could be 'n' (common abbreviation for 'and') and 'n' is found in the answer.
'i' could be 'a' and 'a' is found within the answer.
'about' could be 'c' (abbreviation for circa) and 'c' is present in the answer.
'gypsy' could be 'rom' (a Rom is a member of the Roma people) and 'rom' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Times.
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