Top doctor confining new sovereign to bed (10)

I believe the answer is:

consultant

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'bed' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'top doctor confining new sovereign' is the wordplay.
'top doctor' becomes 'cot' (I am not sure about this - if you are sure you should believe this answer much more).
'confining' indicates putting letters inside.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'sovereign' becomes 'sultan' (title for a royal in some Muslim countries).
'n'+'sultan'='nsultan'
'cot' going around 'nsultan' is 'CONSULTANT'.

'to' acts as a link.

Can you help me to learn more?

(Other definitions for consultant that I've seen before include "Senior hospital doctor" , "Adviser" , "See 1 across" , "Specialist" .)

I've seen this clue in The Independent.

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