Broadcast reveals relatives cover for some soldiers (8)
I believe the answer is:
bearskin
'cover for some soldiers' is the definition.
(cap worn by the Guards of the British army)
'broadcast reveals relatives' is the wordplay.
'broadcast' indicates a 'sounds like' (homophone) clue (how the word might sound on the radio or TV).
'reveals' becomes 'bares' (to bare is to reveal or uncover).
'relatives' becomes 'kin' (I've seen this before).
'bares' sounds like 'bears'.
'bears'+'kin'='BEARSKIN'
(Other definitions for bearskin that I've seen before include "Military cover" , "Military fur cap" , "Regimental helmet of black fur" , "Tall black fur hat" , "hide from wild animal" .)