For the rogue, the end will be nigh (6)

I believe the answer is:

impend

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'be nigh' is the definition.
'impend' can be an answer for 'be' (impending is a kind of being). I'm not sure about the 'nigh' bit.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for impend that I've seen before include "seen to be around the corner" , "Be looming" , "Threaten; approach" , "menace" , "Become imminent" .)

I've seen this clue in the Evening Standard.

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