Midday meal of ancient times, entertaining move by hotel (6)
I believe the answer is:
brunch
'midday meal' is the definition.
(I've seen this in another clue)
'ancient times entertaining move by hotel' is the wordplay.
'ancient times' becomes 'bc' (Before Christ).
'entertaining' means one lot of letters goes inside another.
'move' becomes 'run' (synonyms).
'by' means one lot of letters go next to another.
'hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'bc' placed around 'run' is 'brunc'.
'brunc'+'h'='BRUNCH'
'of' acts as a link.
(Other definitions for brunch that I've seen before include "Late morning repast" , "Meal taken before noon, perhaps" , "Late-morning meal" , "Late morning meal" , "Portmanteau meal" .)