Exposed stout red fighter's fencing term (6)
I believe the answer is:
touche
'fencing term' is the definition.
(I've seen this in another clue)
'exposed stout red fighter's' is the wordplay.
'exposed' says to take the centre (the inside of the word is exposed).
'red fighter' becomes 'che' (I've seen this before. I am not sure about the 'red' bit.).
The centre of 'stout' is 'tou'.
'tou'+'che'='TOUCHE'
Can you help me to learn more?
(Other definitions for touche that I've seen before include "Acknowledgment of a hit in fencing" , "That hit home" , "Fencing cry" , "Fencer's shout" , "cry from fencer" .)