Old platter of fish King's tucked into -- and Queen (8)
I believe the answer is:
trencher
'old platter' is the definition.
'trencher' can be an answer for 'platter' (I've seen this before). I'm not certain of the 'old' bit.
'fish king's tucked into and queen' is the wordplay.
'fish' becomes 'tench' (tench is a kind of fish).
'king' becomes 'r' (r is abbreviation for rex).
'tucked into' means one lot of letters goes inside another (I've seen this in other clues).
'and' is a charade indicator (letters next to each other).
'queen' becomes 'er' (abbreviation for Elizabeth Regina).
'tench' enclosing 'r' is 'trench'.
'trench'+'er'='TRENCHER'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for trencher that I've seen before include "Board" , "one at digs?" , "bearer of food" , "Plate" , "(Old) wooden platter for food" .)