Grasping person before finding support in choir stall (8)
I believe the answer is:
miserere
'support in choir stall' is the definition.
The definition suggests a singular noun which matches the answer.
'grasping person before' is the wordplay.
'grasping person' becomes 'miser' (miser is a kind of person. I am not sure about the 'grasping' bit.).
'before' becomes 'ere' (poetic term for 'before').
'miser'+'ere'='MISERERE'
'finding' acts as a link.
Can you help me to learn more?
(Other definitions for miserere that I've seen before include "plea for mercy" , "Mercy Seat" , "Psalm seeking mercy" , "appeal for mercy" , "Setting of Psalm fifty one" .)