Grub: for starters, one in France gets 'minced steed' – not eaten (10)
I believe the answer is:
undigested
'grub for starters one' is the definition.
I can't judge whether this definition defines the answer.
'in france gets minced steed not eaten' is the wordplay.
'in france' becomes 'un' (I've seen this in other clues).
'minced' indicates anagramming the letters.
'steed not' becomes 'died' (I can't explain this - if you can you should give a lot more credence to this answer).
'eaten' indicates putting letters inside (some letters have eaten others).
'gets' with letters rearranged gives 'gest'.
'gest' inserted within 'died' is 'digested'.
'un'+'digested'='UNDIGESTED'
Can you help me to learn more?
(Another definition for undigested that I've seen is " not fully understood".)