Apprehended for the tribunal, say (6)
I believe the answer is:
caught
'apprehended' is the definition.
(to apprehend is to catch or arrest)
'tribunal say' is the wordplay.
'tribunal' becomes 'court' (synonyms).
'say' shows a homophone (sound like).
'court' is a homophone of 'CAUGHT'.
'for the' acts as a link.
(Other definitions for caught that I've seen before include "Overtaken - in the act?" , "Ensnared" , "report" , "Got" , "Seized" .)