Slump (9)
There are a few possibilities for this:
recession
'slump' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for dip that I've seen before include "Duck" , "Sudden sharp decrease in quantity" , "Lower into liquid" , "An informal swim or a depression" , "Immerse briefly in liquid" .)
'slump' is the definition.
(I know that slump is a kind of sag)
This is all the clue.
(Other definitions for sag that I've seen before include "Sinking" , "Drop" , "Spinach as used in Indian cookery" , "Droop, flag" , "Give in the middle" .)
'slump' is the definition.
(a recession is an economic slump)
This is all the clue.
(Other definitions for recession that I've seen before include "Widespread decline in employment and trade" , "Down-turn" , "Period of temporary economic decline" , "falling back" , "when times are hard" .)