Main feature of gundog, away in Scotland for first time? (8)
I believe the answer is:
seawater
'gundog away in scotland for first time?' is the definition.
I can't judge whether this definition defines the answer.
'main feature' is the wordplay.
'main' becomes 'sea' (the main is an old name for the sea).
'feature' becomes 'water' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'sea'+'water'='SEAWATER'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for seawater that I've seen before include "Brine" , "Drink" , "What breaches dyke, perhaps" .)