Know chap in New York assassinated politician (7)
I believe the answer is:
kennedy
'know chap in new york assassinated politician' is the definition.
I can't tell whether this definition defines the answer.
'know chap in new york' is the wordplay.
'know' becomes 'ken' (I've seen this in another clue).
'chap' becomes 'Ed' (short for Edward).
'in' is an insertion indicator.
'new york' becomes 'ny'.
'ed' put into 'ny' is 'nedy'.
'ken'+'nedy'='KENNEDY'
Can you help me to learn more?
(Other definitions for kennedy that I've seen before include "Catholic US president" , "Nigel -, Br. violinist" , "US president, d. 1963" , "US president assassinated in Dallas" , "Bay-of-Pigs president" .)