Popular revolution protects rights over time: that's moral (9)

I believe the answer is:

incorrupt

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'moral' is the definition.
(similar in meaning)

'popular revolution protects rights over time' is the wordplay.
'popular' becomes 'in' ('in' can mean trendy).
'revolution' becomes 'coup' (a coup against the state).
'protects' is an insertion indicator.
'rights' becomes 'rr' (two abbreviations for right).
'over time' becomes 't' (abbreviation. I am not sure about the 'over' bit.).
'coup' enclosing 'rr' is 'corrup'.
'in'+'corrup'+'t'='INCORRUPT'

'that's' is the link.

Can you help me to learn more?

(Other definitions for incorrupt that I've seen before include "unbribable" , "Pure; purr in cot (anag.)" .)

I've seen this clue in The Times.

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