Welcome letter contains tasty item (8)
I believe the answer is:
omelette
'tasty item' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'welcome letter contains' is the wordplay.
'contains' indicates a hidden word.
'OMELETTE' can be found hidden inside 'welcome letter'.
Can you help me to learn more?
(Other definitions for omelette that I've seen before include "A capsicum pod" , "Food dish (that can't be made without breaking eggs)" , "Egg-based dish" , "Broken-egg dish" , "One must be egged" .)