When it's wrong, don't stand for it! (3)

I believe the answer is:

sit

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'when it's wrong don't' is the definition.
I can't tell whether this defines the answer.

'stand for it' is the wordplay.
'stand' becomes 's' (this might be a standard abbreviation I've not previously seen).
'for' means one lot of letters go next to another.
's'+'it'='SIT'

Can you help me to learn more?

(Other definitions for sit that I've seen before include "Brood" , "Take a chair" , "Be seated" , "Pose (for artist)" , "Order dog to behave" .)

I've seen this clue in the Evening Standard.

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