Time soon mends feelings (8)
I believe the answer is:
emotions
'feelings' is the definition.
(emotion is a kind of feeling)
'time soon mends' is the wordplay.
'mends' indicates an anagram (I've seen 'mended' mean this).
'time'+'soon'='timesoon'
'timesoon' anagrammed gives 'EMOTIONS'.
(Other definitions for emotions that I've seen before include "Passions" , "instinctive feelings" , "Anger and love, say" , "Intense mental feelings, like love or hate" , "Feelings provoked by noise, Tom" .)