In Scots river, way behind (5)

I believe the answer is:

tardy

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'behind' is the definition.
(thesaurus)

'in scots river way' is the wordplay.
'in' is an insertion indicator.
'scots river' becomes 'tay' (Scottish river. I am not sure about the 'scots' bit.).
'way' becomes 'rd'.
'tay' going around 'rd' is 'TARDY'.

Can you help me to learn more?

(Other definitions for tardy that I've seen before include "Unpunctual" , "Late; sluggish" , "Backward" , "Belated" , "Late - slow" .)

I've seen this clue in The Sun.

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