Crossword Genius

Someone who insults Her Majesty on a double-decker? (6)

Ross

I believe the answer is:

abuser

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'someone who insults' is the definition.
'abuser' can be an answer for 'someone' (abuser is a kind of someone). I am not certain of the rest of the definition.

'her majesty on a double-decker?' is the wordplay.
'her majesty' becomes 'ER' (Elizabeth Regina).
'on' means one lot of letters go next to another.
'double-decker?' becomes 'bus' (synonyms).
'a'+'bus'='abus'
'er' put after 'abus' is 'ABUSER'.

Can you help me to learn more?

(Other definitions for abuser that I've seen before include "One mistreating another" , "One who reviles or a misuser of drugs" , "Person who over-indulges in, say, drugs or drink" , "one who uses bad language" , "He takes undue advantage" .)

I've seen this clue in The Times.
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