Definition: "Happy"

This is a container clue - one set of letters goes inside another set of letters to form the answer.

Look for letters that mean 'to gallivant' that can contain or 'swallow' the first letter from 'LSD'. The container indicator is 'swallowing'.

Answer: GLAD | GAD (to gallivant) contains L (drop/first letter of LSD) to give G-L-AD = GLAD (happy)