Crossword Genius

Behind time, jettisoning first of boosters over the moon (6)

Ross

I believe the answer is:

elated

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

'over the moon' is the definition.
(I've seen this before)

'behind time jettisoning first of boosters' is the wordplay.
I cannot quite understand how this works, but
'behind' could be 'late' and 'late' is found within the answer.
The remaining letters 'ed' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for elated that I've seen before include "Overjoyed, really delighted" , "In an enraptured state" , "Intensely happy" , "Delighted, ecstatic" , "In high spirits, very pleased" .)

I've seen this clue in The Times.
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