Is it a chop stewing? That should be roasted! (9)

I believe the answer is:

pistachio

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'should be roasted' is the definition.
I can't tell whether this defines the answer.

'is it a chop stewing?' is the wordplay.
'stewing?' is an anagram indicator.
'is'+'it'+'a'+'chop'='isitachop'
'isitachop' is an anagram of 'PISTACHIO'.

'that' acts as a link.

Can you help me to learn more?

(Other definitions for pistachio that I've seen before include "Food" , "Yellowish-green" , "Nut - it is a chop (anag)" , "Type of nut" , "nuts" .)

I've seen this clue in The Independent.

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