Crossword Genius

Fish about for a plan (4)

Ross

I believe the answer is:

idea

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'for a plan' is the definition.
(both can mean an intention)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for idea that I've seen before include "Purpose" , "Notion, concept" , "Plan" , "Something imagined in the mind" , "intellectual product" .)

I've seen this clue in The Sunday Times and The Times.
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