Zeus' cupbearer forgot name, becoming nervous (4)
I believe the answer is:
edgy
'nervous' is the definition.
(synonyms)
'zeus' cupbearer forgot name' is the wordplay.
I cannot quite see how this works, but
'name' could be 'ed' (short for Edward) and 'ed' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
'becoming' is the link.
Can you help me to learn more?
(Other definitions for edgy that I've seen before include "Visibly nervous" , "Sharp in outline" , "Red shade" , "Challengingly experimental" , "Uneasy" .)