Happy preparing nachos only, with son away (7)
I believe the answer is:
halcyon
'happy' is the definition.
(similar in meaning)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for halcyon that I've seen before include "Prosperous" , "Happy and carefree" , "Calm and peaceful" , "Poetic name for kingfisher" , "Peaceful; golden" .)