A memo to NHS unusually features politician and actor (4,8)
I believe the answer is:
emma thompson
'actor' is the definition.
'a memo to nhs unusually features politician' is the wordplay.
'unusually' is an anagram indicator.
'features' indicates putting letters inside.
'politician' becomes 'mp' (Member of Parliament).
'a'+'memo'+'to'+'nhs'='amemotonhs'
'amemotonhs' is an anagram of 'emmathoson'.
'emmathoson' enclosing 'mp' is 'EMMA THOMPSON'.
'and' acts as a link.
(Other definitions for emma thompson that I've seen before include "Best Actress Oscar winner 1992, for "Howard's End"" , "Theatrical 12/17/19/28 [CANTABRIGIAN]" .)