Loving having a short time with sour characters! (7)
I believe the answer is:
amorous
'loving' is the definition.
(similar in meaning)
'a short time with sour characters' is the wordplay.
'short time' becomes 'mo' (slang abbreviation for 'moment').
'with' is a charade indicator (letters next to each other).
'characters' is an anagram indicator.
'sour' anagrammed gives 'rous'.
'a'+'mo'+'rous'='AMOROUS'
'having' is the link.
(Other definitions for amorous that I've seen before include "Showing or feeling loving feeling" , "Impassioned and loving" , "Like lovers" , "Relating to love" , "Lovong" .)