Wavering badly in the holidays (11)

I believe the answer is:

vacillation

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'wavering' is the definition.
(I know that wavering can be written as vacillation)

'badly in the holidays' is the wordplay.
'badly' becomes 'i'll' (eg in ill-advised).
'in the' indicates putting letters inside.
'holidays' becomes 'vacation' (I can't explain this - if you can you should give a lot more credence to this answer).
'ill' placed within 'vacation' is 'VACILLATION'.

Can you help me to learn more?

(Another definition for vacillation that I've seen is " Indecision; wavering".)

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