Crossword Genius

Rub along, even becoming difficult (12)

Ross

I believe the answer is:

ungovernable

'difficult' is the definition.

'rub along even becoming' is the wordplay.
'becoming' indicates anagramming the letters.
'rub'+'along'+'even'='rubalongeven'
'rubalongeven' is an anagram of 'UNGOVERNABLE'.

(Another definition for ungovernable that I've seen is " Impossible to control".)

I've seen this clue in The Telegraph.
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