Crossword Genius

He swears he's in the cavalry (7)

Ross

I believe the answer is:

trooper

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'he swears' 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 trooper that I've seen before include "Cavalry 21" , "Soldier, proverbial swearer" , "ship" , "Private soldier" , "He swears" .)

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