Wise people, ushers occasionally, protecting Queen (5)

I believe the answer is:

seers

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'wise people' is the definition.
'seers' can be an answer for 'people' (seer is a kind of person). I am not sure about the 'wise' bit.

'ushers occasionally protecting queen' is the wordplay.
'occasionally' indicates alternate letters.
'protecting' indicates putting letters inside (inserted letters are held or protected).
'queen' becomes 'ER' (abbreviation for Elizabeth Regina).
The alternating letters of 'ushers' are 'ses'.
'ses' placed around 'er' is 'SEERS'.

Can you help me to learn more?

(Other definitions for seers that I've seen before include "Prophets" , "wise men" , "They divine the future" , "Visionaries" , "They have visions of the future" .)

I've seen this clue in The Telegraph.

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