Time to give happy ending to listener (4)
I believe the answer is:
year
'time' is the definition.
(year is a unit of time)
'give happy ending to listener' is the wordplay.
'give' says to put letters next to each other.
'ending' indicates one should take the final letters (the letter at the end of the word).
'to listener' becomes 'ear' (body part which hears or listens).
The final letter of 'happy' is 'y'.
'y'+'ear' is 'YEAR'.
'to' is the link.
(Other definitions for year that I've seen before include "Time for earth to go round sun" , "Period of just over 52 weeks" , "eg 2004" , "Student group" , "Manage" .)