New rep intent on getting fixed (13)
I believe the answer is:
predetermined
'fixed' is the definition.
(thesaurus)
'new rep intent on getting' is the wordplay.
'new' indicates anagramming the letters.
'intent on' becomes 'determined' (I've seen this in another clue).
'getting' means one lot of letters go next to another.
'rep' anagrammed gives 'pre'.
'pre'+'determined'='PREDETERMINED'
(Other definitions for predetermined that I've seen before include "Set in advance" , "Settled in advance" , "decided by the Norns?" .)