Menial? Come to the conclusion one will want gold (8)
I believe the answer is:
inferior
'menial?' is the definition.
(thesaurus)
'come to the conclusion one will want gold' is the wordplay.
'come to the conclusion' becomes 'infer' (inferring is a kind of coming to the conclusion).
'one' becomes 'i' (Roman numeral).
'will want' means one lot of letters go next to another.
'gold' becomes 'or' ('or' is the heraldic name for gold).
'infer'+'i'+'or'='INFERIOR'
(Other definitions for inferior that I've seen before include "Lower in status" , "badly done?" , "Subordinate" , "not vintage" , "Of poor quality" .)