One getting into cross-country (5)
I believe the answer is:
spain
'country' is the definition.
(Spain is an example)
'one getting into cross' is the wordplay.
'one' becomes 'i' (Roman numeral).
'getting into' is an insertion indicator.
'cross' becomes 'span' ('span' can be a synonym of 'cross'**).
'i' going inside 'span' is 'SPAIN'.
(Other definitions for spain that I've seen before include "European monarchy" , "Crazy pains?" , "European nation" , "It pains one to be out in this country" , "Iberian country" .)