The most common and most likely answer to this crossword clue is the 6 letter word GILLIE
I've seen this crossword clue in The Guardian
G
I
L
L
I
E
Buddy explains!
The straight part
We know that "shooting party’s guide in Scotland" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case shooting party’s guide in scotland = gillie.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does GILLIE mean?
GILLIE noun- A male attendant of a Scottish Highland chief.
- A fishing and hunting guide; a man or boy who attends to a person who is fishing or hunting, especially in Scotland.
- To be a gillie, a fishing or hunting guide, for (someone).
- A gill of an alcoholic drink.