Cricket ground – somewhere to go round in retirement (4)
I believe the answer is:
oval
'cricket ground' is the definition.
(London cricket ground)
'somewhere to go round in retirement' is the wordplay.
'somewhere to go' becomes 'lav' (short for lavatory).
'round' becomes 'o' (o is a circular letter).
'in retirement' shows that the letters should be reversed in order (retire can mean to go back or backwards).
'lav'+'o'='lavo'
'lavo' back-to-front is 'OVAL'.
(Other definitions for oval that I've seen before include "Elliptical - cricket ground" , "Egg-like" , "Courageous" , "Cricket ground - presidential office" , "Surrey county cricket ground" .)