You must follow Scottish girl in slow part of dance (5)

I believe the answer is:

lassu

'slow part of dance' is the definition.
(slow movement in a Hungarian csardas)

'you must follow scottish girl' is the wordplay.
'you' becomes 'u' (commonly used in online communication).
'must follow' means one lot of letters go next to another.
'scottish girl' becomes 'lass' (Scottish term for a girl).
'u' after 'lass' is 'LASSU'.

'in' acts as a link.

(Another definition for lassu that I've seen is " slow movement".)

I've seen this clue in The Independent.

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