Crossword Genius

Point relation out for introduction (13)

Ross

I believe the answer is:

interpolation

'introduction' is the definition.
(thesaurus)

'point relation out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'point'+'relation'='pointrelation'
'pointrelation' with letters rearranged gives 'INTERPOLATION'.

'for' acts as a link.

(Another definition for interpolation that I've seen is " Interjection".)

I've seen this clue in The Times.
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