Land, not sea, I gathered (7)
I believe the answer is:
estonia
'land' is the definition.
(Estonia is a country)
'not sea i gathered' is the wordplay.
'gathered' is an anagram indicator (the letters are gathered into a new order).
'not'+'sea'+'i'='notseai'
'notseai' with letters rearranged gives 'ESTONIA'.
(Other definitions for estonia that I've seen before include "Country on the Baltic Sea" , "European country, capital Tallinn" , "East European country" , "So eat in here in Eastern Europe" , "One of the Baltic States" .)