Crossword Genius

The militant's first summons (8)

Ross

I believe the answer is:

reveille

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'summons' is the definition.
(thesaurus)

I can't explain the rest of the clue.

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(Other definitions for reveille that I've seen before include "Signal to awaken soldiers at daybreak" , "call to start" , "Early call" , "Army waking signal" , "What soldiers get up to" .)

I've seen this clue in The Guardian and The Globe and Mail.
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