Brought up fish to impress scout who seems tired (6)
I believe the answer is:
sleepy
'tired' is the definition.
(falling asleep)
'brought up fish to impress scout' is the wordplay.
'brought up' shows that the letters should be reversed in order (in a down clue, letters go up).
'fish' becomes 'eels' (eel is a type of fish).
'to impress scout' becomes 'py' (I can't justify this - if you can you should give a lot more credence to this answer).
'eels' written backwards gives 'slee'.
'slee'+'py'='SLEEPY'
'who seems' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for sleepy that I've seen before include "Soporific" , "(Of place) low in activity" , "Is inactive" , "Dozy" , "Feeling tired" .)