With an empty stomach, she of course eats plain trimmed ones on a roll (5,4)
I believe the answer is:
snake eyes
'eats plain trimmed ones on a roll' is the definition.
I can't judge whether this defines the answer.
'with an empty stomach she of course' is the wordplay.
'with' is an insertion indicator.
'an empty' becomes 'E' (abbreviation e.g. on guages).
'stomach she' becomes 'snake' (I can't justify this - if you can you should give a lot more credence to this answer).
'of course' becomes 'yes' (I've seen this in another clue).
'e' placed within 'snake' is 'snakee'.
'snakee'+'yes'='SNAKE EYES'
Can you help me to learn more?
(Another definition for snake eyes that I've seen is " two in game".)