Ground where one's introducing current US president (10)
I believe the answer is:
eisenhower
'us president' is the definition.
(Dwight D Eisenhower, US president 1953-1961)
'ground where one's introducing current' is the wordplay.
'ground' indicates an anagram ('grind' the letters into a new form).
'introducing' means one lot of letters goes inside another (some letters introduced or inserted into others).
'current' becomes 'I' (symbol for electric current).
'where'+'ones'='whereones'
'whereones' is an anagram of 'esenhower'.
'esenhower' enclosing 'i' is 'EISENHOWER'.
(Other definitions for eisenhower that I've seen before include "1950s president" , "US president and general" , "General, President, 'Ike'" , "US president nineteen fifty three to nineteen sixty one" , "American general" .)