Gong showing time for Christmas speech (10)
I believe the answer is:
decoration
'gong showing time' is the definition.
'decoration' can be an answer for 'gong'. I'm unsure of the 'showing time' bit.
'christmas speech' is the wordplay.
'christmas' becomes 'dec' (Dec is short for December, the Christmas period).
'speech' becomes 'oration' (oration is a kind of speech).
'dec'+'oration'='DECORATION'
'for' is the link.
Can you help me to learn more?
(Other definitions for decoration that I've seen before include "Flags put out" , "New Year's honour, say" , "award" , "Star" , "Medal; ornament" .)