Taken prisoner, soldier brought in giving signal (6)
I believe the answer is:
herald
'signal' is the definition.
(herald is a kind of signal)
'taken prisoner soldier brought in' is the wordplay.
I cannot really understand how this works, but
'soldier' could be 'ra' (member of the Royal Artillery) and 'ra' is found within the answer.
'taken' could be 'held' ('hold' can be a synonym of 'take') and 'held' is found within the remaining letters.
This accounts for all the letters.
This may be the basis of clue (or it may be nonsense).
'giving' acts as a link.
Can you help me to learn more?
(Other definitions for herald that I've seen before include "Proclaimer" , "Official crier or messenger" , "Proclaim the approach of, like old messenger" , "Scottish newspaper" , "Announce, presage" .)