Arcadian rotter? (3)

I believe the answer is:

cad

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

'rotter?' is the definition.
(a cad is a dishonourable person)

'arcadian' is the wordplay.
'CAD' is hidden in amongst the letters.
But, I'm uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for cad that I've seen before include "Rotter, bounder" , "A knave, real rotter" , "Blackguard" , "An Englishman who behaves dishonourably, a rotter" , "Wretch" .)

I've seen this clue in the Evening Standard.

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