See reward ultimately in knowing the jargon of Olympic admin? (11)
I believe the answer is:
archdiocese
'see' is the definition.
(see can mean an area associated with a bishop)
'reward ultimately in knowing the jargon of olympic admin?' is the wordplay.
'ultimately' suggests the final letters.
'in' means one lot of letters goes inside another.
'knowing' becomes 'arch' (I've seen this before).
'the jargon of olympic admin?' becomes 'IOCese' (fanciful term for Intl Olympic Committee jargon).
The final letter of 'reward' is 'd'.
'arch'+'iocese'='archiocese'
'd' put into 'archiocese' is 'ARCHDIOCESE'.
(Other definitions for archdiocese that I've seen before include "Important church area" , "York, for example" , "York, say" , "eg York" .)