Hebe's upset when I have a source of sweetness (7)
I believe the answer is:
beehive
'source of sweetness' is the definition.
'beehive' can be an answer for 'source' (I have seen 'Source of honey ' mean 'beehive' so perhaps 'source' could also mean 'beehive'). I am not sure about the 'of sweetness' bit.
'hebe's upset when i have a' is the wordplay.
I cannot quite see how this works, but
'i' is found in the answer.
an anagram of 'hebe' is 'beeh' which is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for beehive that I've seen before include "Home for hymenopterous species" , "place buzzing with activity?" , "where workers gather" , "Enclosure where honey is first made" , "unusually high overheads?" .)