They like rulers to be available in Christmas crackers (11)

I believe the answer is:

monarchists

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'they like rulers to' is the definition.
The definition suggests an adverb but the answer is not.

'available in christmas crackers' is the wordplay.
'available' becomes 'on' (on can mean activated or available).
'in' means one lot of letters goes inside another.
'crackers' indicates anagramming the letters (informal term for mad).
'christmas' is an anagram of 'marchists'.
'on' placed within 'marchists' is 'MONARCHISTS'.

'be' is the link.

Can you help me to learn more?

(Other definitions for monarchists that I've seen before include "These would be for Queen Mary, say" , "those likely to enjoy the Queen's Speech?" .)

I've seen this clue in The Times.

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