Not even up to the far end? (5)
I believe the answer is:
never
'not' is the definition.
(thesaurus)
'even up to the far end?' is the wordplay.
'up' is a reversal indicator (in down clue: letters go upwards).
'to' means one lot of letters go next to another.
'end?' suggests the final letters (I've seen 'ending' mean this).
The final letter of 'far' is 'r'.
'even' backwards is 'neve'.
'neve'+'r'='NEVER'
(Other definitions for never that I've seen before include "Emphatic negative" , "On no account" , "when pigs fly" , "Not in a million years!" , "' - - Say - - Again': Bond film" .)