Crossword Genius

Wrong? French department's suffering with pretty random marking (13)

Ross

I believe the answer is:

tortoiseshell

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

'pretty random marking' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'wrong? french department's suffering' is the wordplay.
'wrong?' becomes 'tort' (legal term).
'french department's' becomes 'Oise's'.
'suffering' becomes 'hell' (hell can mean a terrible ordeal).
'tort'+'oises'+'hell'='TORTOISESHELL'

'with' acts as a link.

Can you help me to learn more?

(Other definitions for tortoiseshell that I've seen before include "Domestic cat mottled in brownish-yellow and black" , "Butterfly - yellow-brown mottled material" , "Mottled plated ornamental substance" , "Domestic cat - or little shoes (anag)" , "The case of the slow-moving" .)

I've seen this clue in The Independent.
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