Overindulgence does maybe end in sobbing when upset (5)
I believe the answer is:
greed
'overindulgence' is the definition.
(thesaurus)
'does maybe end in sobbing when upset' is the wordplay.
'does maybe' becomes 'deer' (I've seen this before. I am not sure about the 'maybe' bit.).
'end in' says to take the final letters.
'when upset' is a reversal indicator (in a down clue - set, written, up).
The last letter of 'sobbing' is 'g'.
'deer'+'g'='deerg'
'deerg' in reverse letter order is 'GREED'.
Can you help me to learn more?
(Other definitions for greed that I've seen before include "Wanting too much" , "sin" , "Selfish desire" , "Avarice, cupidity" , "selfish habit" .)