Crossword Genius

Hotlines, perhaps, between ideologies being different (9)

Ross

I believe the answer is:

isotherms

'hotlines' is the definition.
(lines showing areas with similar temperature)

'between ideologies being different' is the wordplay.
I cannot really see how this works, but
'being' could be 'sot' (sot is a kind of being) and 'sot' is found within the answer.
This may be the basis of clue (or it may be nonsense).

'perhaps' is the link.

(Another definition for isotherms that I've seen is " lines on maps".)

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