Misjudged or judged in EastEnders? (5)

I believe the answer is:

erred

I'm a little stuck... Click here to teach me more about this clue!

'misjudged' is the definition.
(I've seen this in another clue)

I cannot understand how the remainder of the clue works.

(Other definitions for erred that I've seen before include "Committed a sin" , "Gone astray!" , "was inaccurate" , "Went wrong" , "slipped up" .)

I've seen this clue in The Telegraph.

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