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In case of trouble, stopping PC is clearly right (13)

Ross

I believe the answer is:

incontestable

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'clearly right' is the definition.
Both the definition and answer are adjectives. Perhaps you can see a link between them that I can't see?

'in case of trouble stopping pc' is the wordplay.
'case of' suggests removing the centre (like emptying a case).
'stopping' is an insertion indicator (stopping can mean blocking a gap).
'pc' becomes 'constable' (police constable).
'trouble' with its centre removed is 'te'.
'te' put within 'constable' is 'contestable'.
'in'+'contestable'='INCONTESTABLE'

'is' acts as a link.

Can you help me to learn more?

(Other definitions for incontestable that I've seen before include "Without doubt" , "sure" , "Beyond dispute" .)

I've seen this clue in The Telegraph.
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