Clamp holds son on middle of X-ray to reveal innards (7)

I believe the answer is:

viscera

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'innards' is the definition.
(synonyms)

'clamp holds son on middle of x-ray' is the wordplay.
'clamp' becomes 'vise' (I've seen this in another clue).
'holds' is an insertion indicator.
'son on' becomes 'c' (I can't justify this - if you can you should believe this answer much more).
'middle of' says to take the centre.
'x ray' becomes 'x-ray' (synonyms).
The middle of 'xray' is 'ra'.
'vise' going around 'c' is 'visce'.
'visce'+'ra'='VISCERA'

'to reveal' is the link.

Can you help me to learn more?

(Other definitions for viscera that I've seen before include "organs inside" , "Entrails -- CIS rave (anag)" , "Internal organs, intestines" , "Guts" , "Abdominal organs -- cars vie (anag)" .)

I've seen this clue in The Independent.

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