Crossword Genius

Spot suggestive of sixth sense? (4)

Ross

I believe the answer is:

espy

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But I can't explain it at all! Could you help me understand?

(Other definitions for espy that I've seen before include "Watch" , "Discern" , "Catch sight of (poetic)" , "Spot; observe" , "Catch a glimpse of" .)

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