How the waitress said "Only pie for dessert"? (6)
I believe the answer is:
tartly
'how the waitress said' is the definition.
I can't judge whether this defines the answer.
'only pie for dessert?' is the wordplay.
'only pie' becomes 'ly' (I am not sure about this - if you are sure you should believe this answer much more).
'for' means one lot of letters go next to another (I've seen this in other clues).
'dessert?' becomes 'tart' (type of dessert).
'ly' after 'tart' is 'TARTLY'.
Can you help me to learn more?
(Another definition for tartly that I've seen is " In a caustic manner".)