Publicist of legendary batsman (not British) (5)
I believe the answer is:
adman
'publicist' is the definition.
(adman is a kind of publicist)
'batsman not british' is the wordplay.
'batsman' becomes 'bradman' (I've seen this before).
'not' suggests deleting specific letters.
'british' becomes 'br' (abbreviation for British).
'bradman' with 'br' taken out is 'ADMAN'.
'of legendary' acts as a link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for adman that I've seen before include "Someone involved in commercial promotion" , "promoter" , "Commercials writer" , "persuasive type" , "Commercial publicist" .)