Served us tea with grit in it (4)
I believe the answer is:
dust
'grit in it' is the definition.
I can't tell whether this definition defines the answer.
'served us tea with' is the wordplay.
'with' indicates a hidden word.
'DUST' is hidden in the letters of 'served us tea'.
Can you help me to learn more?
(Other definitions for dust that I've seen before include "Clean; fine powder" , "Powdery dirt in dry areas" , "The mortal remains" , "Fine dirt particles" , "Unwanted fine powder" .)