Crossword Genius

Somehow disposed of, one part of armed forces disappeared (7)

Ross

I believe the answer is:

raffled

I'm a little stuck... Click here to teach me more about this clue!

'disappeared' is the definition.
Although both the answer and definition are past participle verbs, I can't see how one could define the other.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Another definition for raffled that I've seen is " Offered to chance purchasers".)

I've seen this clue in The Telegraph.
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