Begin to explain what yours truly did at restaurant? (8)
I believe the answer is:
initiate
'begin' is the definition.
(I've seen this before)
'explain what yours truly did at restaurant?' is the wordplay.
I cannot really see how this works, but
'at' could be 'in' (synonymous in some cases - eg at school, in school) and 'in' is found in the answer.
'yours truly' could be 'i' (the person that set this crossword) and 'i' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
'to' acts as a link.
Can you help me to learn more?
(Other definitions for initiate that I've seen before include "accept new members" , "found" , "Launch or induct" , "Start, launch" , "Start - trigger" .)