A lad arrives furiously combative (11)

I believe the answer is:

adversarial

'combative' is the definition.
(I've seen this before)

'a lad arrives furiously' is the wordplay.
'furiously' indicates anagramming the letters (the letters move around energetically or furiously).
'lad'+'arrives'='ladarrives'
'ladarrives' is an anagram of 'dversarial'.
'a'+'dversarial'='ADVERSARIAL'

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

I've seen this clue in The Times.

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