Crossword Genius

Leads from random encounter could change entire investigation (5)

Ross

I believe the answer is:

recce

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'investigation' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

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(Other definitions for recce that I've seen before include "Advance exploration" , "look round" , "Survey (sl.)" , "Military observation" , "Inspection" .)

I've seen this clue in The Independent.
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