Pipe what's brought on board by waiter finally? (5)
I believe the answer is:
brier
'pipe' is the definition.
(type of tobacco pipe)
'what's brought on board by waiter finally?' is the wordplay.
'what's brought on board' becomes 'brie' (brie might be brought on a cheese board).
'by' is a charade indicator (letters next to each other).
'finally?' indicates one should take the final letters (I've seen 'finally' mean this).
The last letter of 'waiter' is 'r'.
'brie'+'r'='BRIER'
(Other definitions for brier that I've seen before include "smoking pipe" , "It may be smoked" , "plant" , "Prickly shrub" , "Thorny bush like the wild rose" .)