Master at a new isle? (3)
I believe the answer is:
man
'isle?' is the definition.
(Man is an example)
'master at a new' is the wordplay.
'master' becomes 'ma'.
'at' says to put letters next to each other.
'a new' becomes 'n' (common abbreviation eg NT for New Testament).
'ma'+'n'='MAN'
(Other definitions for man that I've seen before include "Isle of -; chess piece" , "race" , "us?" , "Fellow" , "Male person" .)