Such a sleepy town? (9)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

not sure whether to call this a cryptic definition as a whole, or whether to separate it into parts: a dormitory is a name for a town where people live, but will typically go to work or to leisure elsewhere i.e. the town is "sleepy" in the sense that not much activity goes on there …and "sleepy" also hints towards the meanings of dormitory as a place to sleep