Something that's eaten MP in unstable truce (7)

I believe the answer is:

crumpet

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'something that's eaten' is the definition.
I can't judge whether this defines the answer.

'mp in unstable truce' is the wordplay.
'in' means one lot of letters goes inside another.
'unstable' is an anagram indicator.
'truce' anagrammed gives 'cruet'.
'mp' placed into 'cruet' is 'CRUMPET'.

Can you help me to learn more?

(Other definitions for crumpet that I've seen before include "Toasted teacake" , "Something eaten toasted and buttered" , "Old nut" , "Cake usually eaten hot with butter" , "Attractive female" .)

I've seen this clue in The Sun.

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