King is joining the forecasters or that's the writing on the wall? (6)
I believe the answer is:
kismet
'forecasters or that's the writing on the wall?' is the definition.
I can't tell whether this definition defines the answer.
'king is joining the' is the wordplay.
'king' becomes 'K' (abbreviation for king in chess).
'joining' becomes 'me' (I can't justify this - if you can you should believe this answer much more).
'the' becomes 't' (the is pronounced as a 't' sound in some dialects).
'k'+'is'+'me'+'t'='KISMET'
Can you help me to learn more?
(Other definitions for kismet that I've seen before include "Broadway musical" , "lot in life" , "Fate - 1953 musical" , "Will of Allah" , "fortune" .)