Employ Greek and old Arab outside sporting estate (6,4)

'sporting estate' is the definition.
(area for shooting grouse)

'employ greek and old arab outside' is the wordplay.
I cannot quite understand how this works, but
'employ' could be 'use' (synonyms) and 'use' is located in the answer.
'greek' could be 'gr' (abbreviation for Greek) and 'gr' is found in the answer.
'old' could be 'o' (common abbreviation eg in OE for Old English) and 'o' is found within the answer.
'arab' could be 'moor' (Moor could historically mean a North African) and 'moor' is located in the answer.
No letters remain.
This explanation may well be incorrect...

Can you help me to learn more?