Be devout, I beseech you! (4)
I believe the answer is:
pray
'be devout' is the definition.
(I've seen this in another clue)
'i beseech you' is the wordplay.
I cannot really understand how this works, but
'i' could be 'a' and 'a' is found within the answer.
The remaining letters 'pry' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for pray that I've seen before include "Supplicate, entreat" , "make supplications" , "Commune with God" , "Address a deity" , "Beseech" .)