Mass of endless queries shocked maiden (7)
I believe the answer is:
requiem
'mass' is the definition.
(I've seen this before)
'endless queries shocked maiden' is the wordplay.
'endless' means to remove the last letter.
'shocked' indicates anagramming the letters.
'maiden' becomes 'm' (cricket abbreviation).
'queries' with its last letter taken away is 'querie'.
'querie' anagrammed gives 'requie'.
'requie'+'m'='REQUIEM'
'of' acts as a link.
(Other definitions for requiem that I've seen before include "Hymn of mourning" , "Mass for the souls of the dead" , "Funeral service" , "Mass for the departed" , "RC mass for the dead" .)