There's not much to be found during the morning (4)
I believe the answer is:
atom
'there's not much' is the definition.
I can't judge whether this defines the answer.
'to be found during the morning' is the wordplay.
'be found during' means one lot of letters goes inside another.
'the morning' becomes 'am' (as in 12:00 AM).
'to' placed into 'am' is 'ATOM'.
Can you help me to learn more?
(Other definitions for atom that I've seen before include "Scrap" , "A mighty particle, can be explosive" , "A small but mighty particle" , "A really tiny piece of something" , "A mighty particle, makes huge explosion" .)