Time left before end of journey for cardinal (6)
I believe the answer is:
twenty
'cardinal' is the definition.
(similar in meaning)
'time left before end of journey' is the wordplay.
'time' becomes 't' (abbreviation).
'left' becomes 'went' (left can mean went away).
'before' means one lot of letters go next to another.
'end of' says to take the final letters.
The last letter of 'journey' is 'y'.
't'+'went'+'y'='TWENTY'
'for' is the link.
(Other definitions for twenty that I've seen before include "with two crosses" , "Score, XX" , "Dozen plus eight" , "One score" , "previous clue?" .)