### Clue: Hard to avoid temporary difficulty or seven-year one? (4)
### Answer: ITCH 
 ### Explanation: Definition: seven-year one
 "h"(abbrev. for "hard") **deleted from**(to avoid) "hitch"(a temporary difficulty;a snag).
Defn: That which needs to be scratched after seven years of matrimony, the time, it is suggested, when married bliss declines.