Ground where one welcomes island leader (10)
I believe the answer is:
eisenhower
'leader' is the definition.
(I know that Eisenhower was a leader)
'ground where one welcomes island' is the wordplay.
'ground' indicates anagramming the letters ('grind' the letters into a new form).
'welcomes' is an insertion indicator (in sense of 'invites in').
'island' becomes 'is' (geographical abbreviation).
'where'+'one'='whereone'
'whereone' with letters rearranged gives 'eenhower'.
'eenhower' enclosing 'is' is 'EISENHOWER'.
(Other definitions for eisenhower that I've seen before include "General, President, 'Ike'" , "US president and general" , "US president nineteen fifty three to nineteen sixty one" , "American general" , "1950s president" .)