Crossword Genius

Curses musketeer over being posted to front (5)

Ross

I believe the answer is:

oaths

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'curses' is the definition.
(I know this)

I cannot understand how the remainder of the clue works.

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(Other definitions for oaths that I've seen before include "Solemn promises or curses" , "professions of loyalty" , "Solemn sworn promises" , "Swearwords" , "Cursing" .)

I've seen this clue in The Independent.
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