Crossword Genius

For light work tree with a pot should be moved (8)

Ross

I believe the answer is:

operetta

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

'for light work' is the definition.
(I've seen this before)

'tree with a pot should be moved' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'tree' is 'eret' which is within the answer.
'a' is found in the answer.
an anagram of 'pot' is 'opt' which is within the left over letters.
No letters remain.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for operetta that I've seen before include "Eg, The Gondoliers" , "Light musical stage work" , "Light musical drama" , "Make light work" , "Make short work" .)

I've seen this clue in The Times.
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