Hostile butcher arrived, alas (11)

I believe the answer is:

adversarial

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'hostile' is the definition.
Both the definition and answer are adjectives.
Maybe they are linked in a way I don't understand?

'butcher arrived alas' is the wordplay.
'butcher' indicates anagramming the letters.
'arrived'+'alas'='arrivedalas'
'arrivedalas' with letters rearranged gives 'ADVERSARIAL'.

Can you help me to learn more?

(Another definition for adversarial that I've seen is " Combative".)

I've seen this clue in The Telegraph.

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