Return meat sauces firm had marked at the back "with added sweetener" (5-6)
I believe the answer is:
sugar-coated
'return meat sauces firm had marked at the back with added sweetener' is the definition.
I can't tell whether this definition defines the answer.
'firm had marked at the back with added sweetener' is the wordplay.
'firm' becomes 'co' (a firm is a company).
'had' becomes 'ate' ('have' can mean 'eat').
'at the back' suggests the final letters (the letter at the back).
'with' means one lot of letters go next to another.
'added sweetener' becomes 'sugar' (sugar is a kind of sweetener. I am not sure about the 'added' bit.).
The last letter of 'marked' is 'd'.
'co'+'ate'+'d'='coated'
'coated' after 'sugar' is 'SUGAR-COATED'.
Can you help me to learn more?
(Another definition for sugar-coated that I've seen is " Sweetened (as a pill)".)