Forecaster in gold cover-up? (5)
I believe the answer is:
augur
'forecaster' is the definition.
(thesaurus)
'gold cover-up?' is the wordplay.
'gold' becomes 'Au' (Au is the chemical symbol for gold).
'cover' becomes 'rug' (rug is a kind of cover).
'up?' shows that the letters should be reversed in order (in down clue: letters go upwards).
'rug' backwards is 'gur'.
'au'+'gur'='AUGUR'
'in' is the link.
(Other definitions for augur that I've seen before include "Portend a good or/bad outcome" , "Be an omen (of) - Roman religious official" , "Signal" , "Prophet, forecaster" , "Presage, foretell" .)