### Clue: City trimmed part of garden to do post-retirement activity (4,2,3)
### Answer: READ IN BED 
 ### Explanation: Definition: post-retirement activity
 "Reading"(city in England) **minus ****its last letter**(trimmed) + BED(a part/an area of a garden where flowers and plants are grown).
Defn: Something to do after retiring into bed before falling asleep.