Shy pup lost its head and bit Ed when overexcited (5,2)
I believe the answer is:
hyped up
'overexcited' is the definition.
Both the answer and definition are adjectives.
Maybe there's an association between them I don't understand?
'shy pup lost its head and bit ed' is the wordplay.
I cannot really see how this works, but
'ed' is within the answer.
This may be the basis of the clue (or it may be nonsense).
'when' is the link.
Can you help me to learn more?
(Other definitions for hyped up that I've seen before include "high" , "Heavily promoted" , "Artificially stimulated" , "Extravagantly publicised" , "Stimulated, excited (colloq.)" .)