Crossword Genius

Blunder moving along southern borders (4)

Ross

I believe the answer is:

lips

'borders' is the definition.
(I know this)

'blunder moving along southern' is the wordplay.
I cannot quite see how this works, but
'southern' could be 's' (abbreviation) and 's' is present in the answer.
The remaining letters 'lip' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

(Other definitions for lips that I've seen before include "Olivia's two, 'indifferent red' (T. Night)" , "Take, O take those - away (Measure for Measure)" , "margins" , "Edges of the mouth" , "Brims, rims" .)

I've seen this clue in The Times.
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