Black dog moods ultimately creating such high-flyers (3-7)
I believe the answer is:
jet-setters
'high-flyers' is the definition.
(I've seen this before)
'black dog moods ultimately' is the wordplay.
'black' becomes 'jet' ('jet' can be similar in meaning to 'black').
'dog' becomes 'setter' (setter is a kind of dog**).
'ultimately' says to take the final letters.
The last letter of 'moods' is 's'.
'jet'+'setter'+'s'='JET-SETTERS'
'creating such' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for jet-setters that I've seen before include "Trendy folk" , "High-flyers" , "High-fliers" .)