Sandwich, say? Wife tucked into large quantity (4)
I believe the answer is:
town
'sandwich say?' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'wife tucked into large quantity' is the wordplay.
'wife' becomes 'w' (abbreviation).
'tucked into' indicates putting letters inside.
'large quantity' becomes 'ton' (I've seen this in another clue).
'w' put within 'ton' is 'TOWN'.
Can you help me to learn more?
(Other definitions for town that I've seen before include "eg Ripley" , "What revellers paint red" , "It lies between village and city" , "Built-up area" , "Carmathen?" .)