Thought it would make a comeback, in time (6)

I believe the answer is:

notion

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'thought' is the definition.
(I know that notion is a type of thought)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for notion that I've seen before include "Idea, belief" , "Whimsical idea or small sewing article" , "Vague idea or opinion" , "Whim or fancy" , "A vague and possibly incorrect opinion" .)

I've seen this clue in the Evening Standard.

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