### Clue: Quickly like a post at the beginning (4)
### Answer: ASAP 
 ### Explanation: Definition: Quickly
A charade of AS A ('like a') plus P ('**P**ost at the beginning'). Like SSSI in the Brummie yesterday, the use of an abbreviation (in this case of as soon as possible) is not to everyone's liking, with the enumeration (4).