A briny-sounding dish, something tackled by soldiers in training (7,6)
I believe the answer is:
assault course
'something tackled by soldiers in training' is the definition.
(soldiers might train with an assault course)
'a briny-sounding dish' is the wordplay.
'a briny-sounding' becomes 'assault' (I can't justify this - if you can you should give a lot more credence to this answer).
'dish' becomes 'course'.
'assault'+'course'='ASSAULT COURSE'
(Other definitions for assault course that I've seen before include "Soldier training circuit" , "for cadets in training?" , "Training exercise (mil.)" , "physical test" , "Test of fitness and endurance" .)