Hard to ignore anguished moving prayer (5,3)
I believe the answer is:
agnus dei
'prayer' is the definition.
(Agnus Dei is an example)
'hard to ignore anguished moving' is the wordplay.
'hard' becomes 'h' (abbreviation used in pencil classifications).
'to ignore' is a deletion indicator.
'moving' indicates an anagram.
'anguished' with 'h' removed is 'anguised'.
'anguised' anagrammed gives 'AGNUS DEI'.
(Other definitions for agnus dei that I've seen before include "Christian emblem" , "Part of Latin Mass" , "part in requiem" , "Part of the ordinary" , "Section of mass" .)