Crossword Genius

Insect delineated path leading to top of trench (6)

Ross

I believe the answer is:

locust

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'insect' is the definition.
(locust is a kind of insect)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for locust that I've seen before include "Swarming grasshopper" , "Migratory crop stripper" , "beast resulting in destruction" , "Large insect" , "Swarming, devouring, insect" .)

I've seen this clue in The Independent.
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