Deterrent power finds place in an absurd policy chart (12)

I believe the answer is:

prophylactic

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'deterrent' is the definition.
(thesaurus)

'in an absurd policy chart' is the wordplay.
'in an' becomes 'p' (I can't explain this - if you can you should give a lot more credence to this answer).
'absurd' indicates an anagram.
'policy'+'chart'='policychart'
'policychart' with letters rearranged gives 'rophylactic'.
'p'+'rophylactic'='PROPHYLACTIC'

'power finds place' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

I've seen this clue in The Hindu.

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