Conventional mother bathing, perhaps (10)
I believe the answer is:
mainstream
'conventional' is the definition.
(I've seen this before)
'mother bathing perhaps' is the wordplay.
I cannot quite see how this works, but
'mother' could be 'ma' (ma can mean mother) and 'ma' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for mainstream that I've seen before include "People representing most common ideas" , "entirely conventional?" , "conventional activities" , "Current" , "Conventional, normal" .)