20 across
Enquiry
identifies
food
included
in
sample
(8)
Enquiry identifies food included in sample (8)
hints
0
checks
0
hints
The definition is at the beginning of the clue.
How the clue works
Look at Enquiry — that's your definition, pointing you towards a formal investigation. Now for the wordplay: take TRIAL, meaning sample, and tuck the food BUN inside it, giving you TRI-BUN-AL.