A full treatment for all those interior parts (3,5)

I believe the answer is:

the works

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'a full treatment' is the definition.
'the works' can be an answer for 'treatment' (I have seen 'Comprehensive treatment' mean 'the works' so perhaps 'treatment' could also mean 'the works'). I'm not sure about the 'a full' bit.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for the works that I've seen before include "plant?" , "(Give it) everything" , "factory?" , "Comprehensive treatment" .)

I've seen this clue in the Evening Standard.

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