Agreed title sees Knight in lower position (4)
I believe the answer is:
amen
'agreed' is the definition.
(thesaurus)
'title sees knight in lower position' is the wordplay.
I cannot quite see how this works, but
'knight' could be 'n' (chess abbreviation) and 'n' is found in the answer.
The remaining letters 'ame' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for amen that I've seen before include "Word of agreement" , "I agree!" , "Conclusion of prayer" , "Name for end to prayer" , "as agreed!" .)