Depression over new setback (4)
I believe the answer is:
snag
'setback' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
'depression over new' is the wordplay.
'depression' becomes 'sag' (sag is a kind of depression).
'over' indicates putting letters inside.
'new' becomes 'n'.
'sag' placed around 'n' is 'SNAG'.
Can you help me to learn more?
(Other definitions for snag that I've seen before include "Glitch" , "Hitch, obstacle" , "Unexpected difficulty" , "Minor hitch" , "Slight problem" .)