Metal seat for the first queen (6)
I believe the answer is:
pewter
'metal' is the definition.
(pewter is a kind of metal)
'seat for the first queen' is the wordplay.
'seat' becomes 'pew' (pew is a kind of seat**).
'for' says to put letters next to each other.
'first' says to take the initial letters.
'queen' becomes 'er' (abbreviation for Elizabeth Regina).
The first letter of 'the' is 't'.
'pew'+'t'+'er'='PEWTER'
(Other definitions for pewter that I've seen before include "Bluish-grey alloy" , "Tin alloy used in tankards, etc" , "Silver-grey alloy" , "Alloy of tin with copper and antimony" , "Tin alloy used to make plates and mugs" .)