Tucking into bread with sweet topping, king had a merry time (9)

I believe the answer is:

rollicked

I'm a little stuck... Click here to teach me more about this clue!

'had a merry time' is the definition.
Although both the answer and definition are past participle verbs, I cannot understand how one could define the other.

'tucking into bread with sweet topping king' is the wordplay.
'tucking into' is an insertion indicator.
'bread' becomes 'roll' (roll is a kind of bread).
'with sweet topping' becomes 'iced' (I am not sure about this - if you are sure you should believe this answer much more).
'king' becomes 'K' (abbreviation for king in chess).
'roll'+'iced'='rolliced'
'rolliced' enclosing 'k' is 'ROLLICKED'.

Can you help me to learn more?

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.