Eggs left in cricket ground (4)
I believe the answer is:
oval
'cricket ground' is the definition.
(London cricket ground)
'eggs left' is the wordplay.
'eggs' becomes 'ova' (term for egg cells).
'left' becomes 'l' (common abbreviation).
'ova'+'l'='OVAL'
'in' acts as a link.
(Other definitions for oval that I've seen before include "Egg shape, roughly" , "Where a duck may be broken" , "Squashed circle" , "Ellipsoidal" , "not quite round" .)