Moan about some land (4)
I believe the answer is:
oman
'some land' is the definition.
(Oman is an example)
'moan about' is the wordplay.
'about' indicates anagramming the letters.
'moan' with letters rearranged gives 'OMAN'.
(Other definitions for oman that I've seen before include "Sultanate on the south-east coast of the Arabian Peninsula" , "Former Gulf country, Muscat and --" , "Arabian country, capital Muscat" , "Sultanate in southwest Asia" , "Land" .)