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Go up into sanctum and fall (6)

Ross

I believe the answer is:

deepen

I'm a little stuck... Click here to teach me more about this clue!

'fall' is the definition.
The definition and answer can be both related to change as well as being verbs in their base form.
Perhaps you can see a link between them that I can't see?

'go up into sanctum' is the wordplay.
'go' becomes 'pee' (both can mean to urinate).
'up' is a reversal indicator (in down clue: letters go upwards).
'into' indicates putting letters inside.
'sanctum' becomes 'den' (I've seen this in another clue).
'pee' backwards is 'eep'.
'eep' inserted inside 'den' is 'DEEPEN'.

'and' acts as a link.

Can you help me to learn more?

(Other definitions for deepen that I've seen before include "make room for more water" , "Get stronger" , "Make stronger" , "Make or become more profound" , "Increase in depth" .)

I've seen this clue in The Times.
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