Stinging insect has boy turning blue — bring in doctor with case of epinephrine (6,3)

'stinging insect' is the definition.
I know nothing about this answer so I can't tell whether this works.

'boy turning blue bring in doctor with case of epinephrine' is the wordplay.
I cannot really see how this works, but
'boy' could be 'b' (abbreviation used in schools) and 'b' is found in the answer.
'doctor' could be 'mb' (Bachelor of Medicine) and 'mb' is found in the answer.
an anagram of 'blue' is 'uleb' which is present in the remaining letters.
The remaining letters 'ee' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'has' is the link.

Can you help me to learn more?