Crossword Genius

Note assailant finally boards craft (8)

Ross

I believe the answer is:

crotchet

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'note' is the definition.
(musical note)

I cannot understand how the rest of the clue works.

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(Other definitions for crotchet that I've seen before include "A note in music equal to half a minim" , "Quarter of a semibreve" , "One in bar" , "Fancy" , "as mark scored" .)

I've seen this clue in The Sun.
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