Sermon here: if no good, do this with text? (6)

I believe the answer is:
pulpit
'do this with text?' is the definition.
The definition suggests a singular noun which matches the answer.
'sermon here if no good' is the wordplay.
I cannot quite understand how this works, but
'good' could be 'pi' (old-fashioned term for pious) and 'pi' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for pulpit that I've seen before include "From which minister spouts" , "From which to preach sermons" , "Podium for preaching" , "Preacher's platform" , "Sermons are preached from it" .)