Crossword Genius

Material from fleet admiral in Split (4)

Ross

I believe the answer is:

fled

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'split' is the definition.
The answer and definition are different parts of speech. However, past participle verbs and adjectives can sometimes mean the same thing.

I cannot understand how the remainder of the clue works.

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(Other definitions for fled that I've seen before include "Left the field" , "Did a runner" , "Ran or hurried away" , "Having run or hurried away" , "Ran off in a hurry" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.
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