Partners accepting not very exciting male organ (6)
I believe the answer is:
stamen
'male organ' is the definition.
'stamen' can be an answer for 'organ' (I have seen 'Reproductive organ' mean 'stamen' so perhaps 'organ' could also mean 'stamen'). I am not sure about the 'male' bit.
'partners accepting not very exciting' is the wordplay.
'partners' becomes 'sn' (South and North are partners in the game bridge).
'accepting' means one lot of letters goes inside another (inserted letters are accepted).
'not very exciting' becomes 'tame' (I've seen this in another clue).
'sn' enclosing 'tame' is 'STAMEN'.
Can you help me to learn more?
(Other definitions for stamen that I've seen before include "Male reproductive organ of a flower" , "Male fertilising organ of flowering plants" , "Flower's male reproductive organ" , "Section of a flower" , "Bit of a bloomer" .)