Crossword Genius

Likely to spread too, causing boils (10)

Ross

I believe the answer is:

contagious

I'm a little stuck... Click here to teach me more about this clue!

'likely to spread' is the definition.
I can't judge whether this definition defines the answer.

'too causing boils' is the wordplay.
'boils' is an anagram indicator (I've seen 'boiling' mean this).
'too'+'causing'='toocausing'
'toocausing' anagrammed gives 'CONTAGIOUS'.

Can you help me to learn more?

(Another definition for contagious that I've seen is " Catching".)

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