Journalists welcoming time inside hollow monumental stones (8)
I believe the answer is:
emeralds
'stones' is the definition.
(I've seen this before)
'journalists welcoming time inside hollow monumental' is the wordplay.
I cannot really see how this works, but
'time' could be 'era' (I've seen this before) and 'era' is located in the answer.
This may be the basis of clue (or it may be nonsense).
(Other definitions for emeralds that I've seen before include "Green stones from strangely red males" , "Colours" , "Green gems" , "Mere lads (anag.)" , "Precious stones for odd red males" .)