Where one may pray for eloquence of speech (7)
I believe the answer is:
oratory
'speech' is the definition.
(I know that oratory is a type of speech)
'where one may pray for eloquence of' is the wordplay.
I cannot really understand how this works, but
'one' could be 'a' (a thing is one thing) and 'a' is present in the answer.
'for' could be 'to' (eg both can mean 'in the opinion of') and 'to' is found in the answer.
'of' could be 'o' and 'o' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for oratory that I've seen before include "Art or skill of public speaking" , "devotional space" , "Rhetoric - place of prayer" , "Small chapel for private worship" , "Cicero's art" .)