Singer is exposed while keeping it on (8)

I believe the answer is:

baritone

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'singer' is the definition.
(I know that baritone is a type of singer)

'exposed while keeping it on' is the wordplay.
'exposed while' becomes 'bare' (I can't explain this - if you can you should give a lot more credence to this answer).
'keeping' is an insertion indicator (some letters kept inside).
'it'+'on'='iton'
'bare' placed around 'iton' is 'BARITONE'.

'is' acts as a link.

Can you help me to learn more?

(Other definitions for baritone that I've seen before include "Male singer in boater, strangely" , "Male voice between bass and tenor" , "Male singer looks odd in boater" , "Male voice with deep register" , "solo voice" .)

I've seen this clue in The Times.

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