Showing yours truly wearing a piece of jewellery (6)
I believe the answer is:
airing
'showing' is the definition.
(both can mean broadcasting)
'yours truly wearing a piece of jewellery' is the wordplay.
'yours truly' becomes 'I' (the person who set this crossword).
'wearing' means one lot of letters goes inside another.
'piece of jewellery' becomes 'ring' (I've seen this before).
'a'+'ring'='aring'
'i' put inside 'aring' is 'AIRING'.
(Other definitions for airing that I've seen before include "Broadcast" , "Expressing (an opinion) publicly" , "Ventilating, say a grievance" , "Expressing (a grievance) publicly" , "excursion" .)