Keeper in grounds stopped by a beast's cry (4,6)
I believe the answer is:
game warden
'keeper' is the definition.
(game warden is a kind of keeper)
'grounds stopped by a beast's cry' is the wordplay.
'grounds' becomes 'garden' (garden is a kind of grounds).
'stopped by' indicates putting letters inside (I've seen this in other clues).
'beast's cry' becomes 'mew' (I can't justify this - if you can you should give a lot more credence to this answer).
'a'+'mew'='amew'
'garden' going around 'amew' is 'GAME WARDEN'.
'in' is the link.
Can you help me to learn more?
(Other definitions for game warden that I've seen before include "Reserve keeper" , "reserve worker" , "One employed to protect rhinos, say" , "Ranger" , "Wild animal guardian" .)