One enquiring when king and queen meet (5)

I believe the answer is:

asker

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'one enquiring' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'when king and queen meet' is the wordplay.
'when' becomes 'as' (eg 'when I walked' means 'as I walked').
'king and queen' becomes 'ker' (K for King and ER for Elizabeth Regina).
'meet' says to put letters next to each other.
'as'+'ker'='ASKER'

Can you help me to learn more?

(Other definitions for asker that I've seen before include "One seeking" , "One requesting" , "beggar" , "newt" .)

I've seen this clue in The Times.

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