We hear defence submissions give satisfaction (6)
I believe the answer is:
please
'give satisfaction' is the definition.
(I've seen this before)
'we hear defence submissions' is the wordplay.
I cannot quite see how this works, but
'defence' could be 'plea' (a plea is a legal defence) and 'plea' is found in the answer.
The remaining letters 'se' 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 please that I've seen before include "Satisfy or gratify" , "Give satisfaction to" , "Gratify as by a sleep" , "Like" , "Gratify, make contented" .)