Set off starters of escargots and shallots with stomach linings (6)
I believe the answer is:
tripes
'stomach linings' is the definition.
'tripes' can be an answer for 'stomach' (thesaurus). I'm not certain of the 'linings' bit.
'set off starters of escargots and shallots' is the wordplay.
'set off' becomes 'trip' ('trip' can be a synonym of 'set off').
'starters of' says to take the initial letters.
'and' is a charade indicator (letters next to each other).
'shallots' becomes 's' (this could be a standard abbreviation of which I'm unaware).
The initial letter of 'escargots' is 'e'.
'trip'+'e'+'s'='TRIPES'
'with' acts as a link.
Can you help me to learn more?
(Another definition for tripes that I've seen is " Ox stomachs as food for priest".)