Unaffectionate father I like to send up (6)
I believe the answer is:
frigid
'unaffectionate' is the definition.
(thesaurus)
'father i like to send up' is the wordplay.
'father' becomes 'fr'.
'like' becomes 'dig' (I've seen this in other clues).
'to send up' says the letters should be written in reverse.
'dig' back-to-front is 'gid'.
'fr'+'i'+'gid'='FRIGID'
(Other definitions for frigid that I've seen before include "Glacial" , "Passionless, unresponsive" , "far from warm" , "Frosty" , "Icy" .)