Prime Minister, oddly only first of seven (5)
I believe the answer is:
lyons
'prime minister' is the definition.
(Australian prime minister 1932-1939)
'oddly only first of seven' is the wordplay.
'oddly' indicates an anagram.
'first of seven' becomes 's' (1st letter of 'seven').
'only' with letters rearranged gives 'lyon'.
'lyon'+'s'='LYONS'
(Other definitions for lyons that I've seen before include "Capital of Rhone department of France" , "anglicised French place name" , "French city" , "Famous caterer" , "City of central France" .)