Stress English politician has income support initially (8)
I believe the answer is:
emphasis
'stress' is the definition.
(synonyms)
'english politician has income support initially' is the wordplay.
'english' becomes 'e' (abbreviation).
'politician' becomes 'mp' (Member of Parliament).
'initially' says to take the initial letters.
The initial letters of 'income support' is 'is'.
'e'+'mp'+'has'+'is'='EMPHASIS'
(Other definitions for emphasis that I've seen before include "Stress, special importance" , "Stress, accentuation" , "Stress laid on, eg, words" , "Intensity of expression" , "Special importance or prominence given to something" .)