Department stores priest runs for one who waits (9)
I believe the answer is:
sommelier
'one who waits' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'department stores priest runs' is the wordplay.
'department' becomes 'somme' (I can't explain this - if you can you should believe this answer much more).
'stores' indicates putting letters inside.
'priest' becomes 'eli' (biblical figure).
'runs' becomes 'r' (cricket abbreviation).
'somme' going around 'eli' is 'sommelie'.
'sommelie'+'r'='SOMMELIER'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for sommelier that I've seen before include "Wine steward" , "Wine waiter" , "One waits" , "The wine expert-server in a hotel" , "Expert" .)