Reveal that the day is near (8)
I believe the answer is:
disclose
'reveal' is the definition.
(I know that reveal can be written as disclose)
'the day is near' is the wordplay.
'the day' becomes 'd' (abbreviation for day).
'near' becomes 'close' (synonyms).
'd'+'is'+'close'='DISCLOSE'
'that' is the link.
(Other definitions for disclose that I've seen before include "Betray" , "broadcast" , "Uncover" , "Divulge, reveal" , "Make public" .)