What the detective picks up from Mick's reports? The travellers are bound to swallow them! (5,3)
I believe the answer is:
trail mix
I'm afraid I can't explain this answer.
Can you help me to learn more?
(Other definitions for trail mix that I've seen before include "Snack of dried fruit and nuts" , "traveller's fare" , "snack for hikers as before" .)