No good entering antelope country (7)
I believe the answer is:
england
'country' is the definition.
(England is an example)
'no good entering antelope' is the wordplay.
'no' becomes 'n' (common abbreviation).
'good' becomes 'g' (abbreviation).
'entering' is an insertion indicator.
'antelope' becomes 'eland' (eland is a kind of antelope).
'n'+'g'='ng'
'ng' placed inside 'eland' is 'ENGLAND'.
(Other definitions for england that I've seen before include "Cricket team" , "' - - expects' (Nelson)" , "Lend nag out to the country" , "CARRY ON FILM" , "Albion" .)