One on the board at church: not her, we’re told (4)
I believe the answer is:
hymn
'one on the board at church' is the definition.
I can't tell whether this definition defines the answer.
'not her we're told' is the wordplay.
'not her' becomes 'him' (I've seen this in another clue).
'we're told' shows a homophone (sound like).
'him' sounds like 'HYMN'.
Can you help me to learn more?
(Other definitions for hymn that I've seen before include "sort of song" , "Sacred song of praise" , "Religious song of praise" , "Song of worship" , "Orison" .)