Tremulous at heart, groom left after meal (7)
I believe the answer is:
uneaten
'left after meal' is the definition.
'uneaten' can be an answer for 'left' (I've seen this before). I am unsure of the 'after meal' bit.
'tremulous at heart groom' is the wordplay.
'at heart' indicates the central letters.
'groom' becomes 'neaten' (synonyms).
The middle of 'tremulous' is 'u'.
'u'+'neaten'='UNEATEN'
Can you help me to learn more?
(Other definitions for uneaten that I've seen before include "still on the table?" , "not chewed" , "Make an outline of" , "Not consumed as food" , "Not taken in" .)