Crossword Genius

Nonsense in letter from Pope (4)

Ross

I believe the answer is:

bull

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'nonsense' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for bull that I've seen before include "fifty on board" , "Taurus in the Constellations" , "Male whale" , "motion is > nonsense" , "rubbish" .)

I've seen this clue in The Sun.
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