Crossword Genius

Agitation in Unite upset with Old Bill (10)

Ross

I believe the answer is:

ebullition

'agitation' is the definition.
(thesaurus)

'unite upset with old bill' is the wordplay.
'upset with' indicates anagramming the letters.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'o'+'bill'='obill'
'unite' mixed up with 'obill' makes 'EBULLITION'.

'in' is the link.

I've seen this clue in The Times.
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