Cattle going to water in Scotland, being smart (8)
I believe the answer is:
neatness
'being smart' is the definition.
'cattle going to water in scotland' is the wordplay.
'cattle' becomes 'neat' (I've seen this before).
'going to' means one lot of letters go next to another.
'water in scotland' becomes 'ness' (Loch Ness, Scottish loch).
'neat'+'ness'='NEATNESS'
(Other definitions for neatness that I've seen before include "Good order" , "smart condition" , "well-tended condition" , "condition of the pure in spirit?" , "Tidy quality" .)