It's not meant to be made in Polperro, really (5)

I believe the answer is:

error

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

'it's not meant to be' is the definition.
I can't tell whether this defines the answer.

'in polperro really' is the wordplay.
'in' indicates a hidden word.
'ERROR' is hidden in the letters of 'polperro really'.

'made' acts as a link.

Can you help me to learn more?

(Other definitions for error that I've seen before include "Slip, mistake" , "heresy" , "Solecism" , "Gaffe" , "Trial and ___" .)

I've seen this clue in the Evening Standard.

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