Initially rounding up runaways at large in the country (5)
I believe the answer is:
rural
'in the country' is the definition.
(rural means in the countryside)
'initially rounding up runaways at large' is the wordplay.
'initially' suggests taking the first letters.
The first letters of 'rounding up runaways at large' is 'RURAL'.
(Other definitions for rural that I've seen before include "Relating to the countryside" , "Characteristic of the countryside" , "Not urban" , "Connected with farming" , "Bucolic; pastoral" .)