With a new clue I'd get the mathematician (6)
I believe the answer is:
euclid
'the mathematician' is the definition.
(Euclid is an example)
'with a new clue i'd' is the wordplay.
'with' says to put letters next to each other.
'a new' is an anagram indicator.
'clue' is an anagram of 'eucl'.
'eucl' put next to 'id' is 'EUCLID'.
'get' is the link.
(Other definitions for euclid that I've seen before include "Alexandrian mathematician" , "Old mathematician" , "Greek mathematician c. three hundred BC" , "Greek father of geometry" , "mathematician appears" .)