Cryptic puzzle — fled from magnetic field (9)
I believe the answer is:
enigmatic
'cryptic' is the definition.
(thesaurus)
'puzzle fled from magnetic field' is the wordplay.
'puzzle' indicates an anagram.
'from' is a deletion indicator.
'magnetic'+'field'='magneticfield'
'magneticfield' with 'fled' taken away is 'magnticie'.
'magnticie' anagrammed gives 'ENIGMATIC'.
(Other definitions for enigmatic that I've seen before include "Hard to fathom" , "not obvious" , "Puzzling, like the Sphinx" , "Obscure, puzzling" , "with a mystery ingredient" .)