Pass daughter, indifferent (4)
I believe the answer is:
cold
'indifferent' is the definition.
(thesaurus)
'pass daughter' is the wordplay.
'pass' becomes 'col' (col is a term for a mountain pass).
'daughter' becomes 'd' (genealogical abbreviation).
'col'+'d'='COLD'
(Other definitions for cold that I've seen before include "At low temperature" , "Biting" , "Unfriendly" , "Frigid" , "Unfeeling" .)