In eager anticipation since seven in morning (4)
I believe the answer is:
agog
'in eager anticipation' is the definition.
(I've seen this in another clue)
'since seven in morning' is the wordplay.
'since' becomes 'ago' (I've seen this in another clue).
'seven in morning' becomes 'g' (I can't justify this - if you can you should give a lot more credence to this answer).
'ago'+'g'='AGOG'
Can you help me to learn more?
(Other definitions for agog that I've seen before include "Looking amazed" , "Interested, excited and eager to know more" , "Wide-eyed and amazed" , "Wide-eyed and fascinated" , "Eagerly awaiting" .)