A couple of queens lay on a banquet perhaps (5)
I believe the answer is:
cater
'lay on a banquet perhaps' is the definition.
I can't judge whether this definition defines the answer.
'a couple of queens' is the wordplay.
'a couple of queens' can mean two replacements for 'queen'.
'queen' becomes 'cat' (a queen is a female cat).
'queen' becomes 'ER' (short for Elizabeth Regina ie Queen Elizabeth).
'cat'+'er'='CATER'
Can you help me to learn more?
(Other definitions for cater that I've seen before include "so put out food?" , "Supply food for parties" , "Provide goods or services for" , "Make provision for" , "Provide what is required" .)