What might be seen in faulty poster? (4)

I believe the answer is:

typo

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'what might be' is the definition.
I can't judge whether this definition defines the answer.

'in faulty poster?' is the wordplay.
'in' says the answer is hidden in the clue.
'TYPO' is hidden within 'faulty poster'.

'seen' acts as a link.

Can you help me to learn more?

(Other definitions for typo that I've seen before include "Keyboard slip-up" , "Literal - printing mistake" , "Character flaw" , "Finger problem" , "What's not right" .)

I've seen this clue in The Times.

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