The most common and most likely answer to this crossword clue is the 6 plus 1 letter word MAITRE D
I've seen this crossword clue in The Daily Telegraph
M
A
I
T
R
E
D
More clues leading to the result MAITRE D
- I dreamt about this hotel manager
- One serving cooked meal: it's eaten very warm
- Steward tolerated him when drunk
- After a month in Paris, man claims right to be hotel manager
- Confused mediator ignoring old hotel employee
- Waiter is ace carving into joint before start of dinner
- Head waiter and helper girl carrying evenly carved turkey
- Three in Rome accommodated by domestic restaurant host
Buddy explains!

The straight part
We know that "Waiter" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case waiter = maitre d.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.