Moral part of the twentieth I call it (7)

I believe the answer is:

ethical

'moral' is the definition.
(synonyms)

'part of the twentieth i call it' is the wordplay.
'part of' indicates a hidden word.
'ETHICAL' is hidden within 'twentieth i call it'.

(Other definitions for ethical that I've seen before include "In accordance with approved moral standards" , "Morally acceptable" , "Principled (behaviour)" , "lt's available on prescription only" , "Morally correct, in accordance with principles" .)

I've seen this clue in The Irish Independent.

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