Low emotional state finishing early (3)
I believe the answer is:
moo
'low' is the definition.
(both can mean to make the noise of a cow)
'emotional state finishing early' is the wordplay.
'emotional state' becomes 'mood' (your mood is your emotions).
'finishing early' means to remove the last letter (the word finishes earlier than normal).
'mood' with its last letter removed is 'MOO'.
(Other definitions for moo that I've seen before include "unpopular woman" , "Low (of cattle)" , "Cartoon sound of a cow" , "Bovine low" , "Cow's sound" .)