Crossword Genius

Frame way to describe Princess Royal? (7)

Ross

I believe the answer is:

chassis

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'frame' is the definition.
(base frame of a vehicle)

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 "Car framework" , "Car's body" , "Vehicle structure" , "Bodywork" , "Car body" .)

I've seen this clue in The Sun, The Times and The Telegraph.
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