Get the wrong idea (13)

I believe the answer is:

misunderstand

'get the wrong idea' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for misunderstand that I've seen before include "Fail to comprehend" , "Make little of" , "Fail to construe correctly" , "Fail to interpret correctly" , "Interpret wrongly" .)

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

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