Gold and silver, say, affected temperature during repasts (8,6)

'gold' is the definition.
(thesaurus)

'affected temperature during repasts' is the wordplay.
'affected' becomes 'precious' (I am not sure about this - if you are sure you should believe this answer much more).
'temperature' becomes 't' (abbreviation).
'during' means one lot of letters goes inside another.
'repasts' becomes 'meals' ('meal' can be a synonym of 'repast').
't' inserted into 'meals' is 'metals'.
'precious'+'metals'='PRECIOUS METALS'

'and silver say' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?