Conclude EastEnders' trial, winning (9)
I believe the answer is:
endearing
'trial winning' is the definition.
'endearing' can be an answer for 'winning' (winning can mean endearing or likable). I'm unsure of the 'trial' bit.
'conclude eastenders'' is the wordplay.
'conclude' becomes 'end' (I've seen this before).
'eastenders'' becomes 'earing' (I am not sure about this - if you are sure you should believe this answer much more).
'end'+'earing'='ENDEARING'
Can you help me to learn more?
(Other definitions for endearing that I've seen before include "delightful" , "Engaging" , "Inspiring affection" , "Disarming" , "Charming" .)