Crossword Genius

Dacoit leader first off, to rob, vanish (7)

Ross

I believe the answer is:

dwindle

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'vanish' is the definition.
(thesaurus)

I can't explain the rest of the clue.

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(Other definitions for dwindle that I've seen before include "Get smaller, less" , "Die away" , "Peter out" , "Degenerate" , "Become gradually less or smaller" .)

I've seen this clue in The Hindu.
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