Report describing end of Stein's quite fancy dining (10)

'dining' is the definition.

'report describing end of stein's quite fancy' is the wordplay.
'report' becomes 'bang' (I've seen this before**).
'describing' means one lot of letters goes inside another (describe can mean to form the outline of).
'end of' says to take the final letters.
'fancy' indicates anagramming the letters.
The last letter of 'stein' is 'n'.
'n'+'quite'='nquite'
'nquite' anagrammed gives 'quetin'.
'bang' placed around 'quetin' is 'BANQUETING'.