Crossword Genius

Framework from Princess Royal? (7)

Ross

I believe the answer is:

chassis

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'framework' is the definition.
(chassis is a kind of framework)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for chassis that I've seen before include "Undercarriage" , "Base-frame of car" , "an estate may be built on it" , "Car body" , "Car's body" .)

I've seen this clue in The Sun.
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