Scotsman mentions missing bouquet that's developing (7)
I believe the answer is:
nascent
'developing' is the definition.
(nascent means developing or just beginning)
'scotsman mentions missing bouquet' is the wordplay.
I cannot really understand how this works, but
'bouquet' could be 'scent' (the scent of a wine) and 'scent' is located in the answer.
The remaining letters 'na' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'that's' is the link.
Can you help me to learn more?
(Other definitions for nascent that I've seen before include "Coming alive" , "Budding early" , "Beginning to show signs of potential" , "Starting existence" , "being developed" .)