Not the nicest of Orcadians (3)

I believe the answer is:

cad

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'not the nicest' is the definition.
I can't tell whether this definition defines the answer.

'of orcadians' is the wordplay.
'of' indicates a hidden word.
'CAD' can be found hidden inside 'orcadians'.

Can you help me to learn more?

(Other definitions for cad that I've seen before include "Ungentlemanly person" , "One behaves dishonourably" , "Dishonourable man of decadent sort" , "A knave, real rotter" , "Rogue" .)

I've seen this clue in the Evening Standard.

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