Sat Dt Prize Cryptic 27,899

[maxi2]

15d, Misleadingly, perhaps put in policing organisation, getting knocked back. I have I-t-r-o-a-e and I can't see why it's interpolate. Can anyone explain please?

[mac44]

Interpol ate

[Calibax]

Interpolate to insert a word or passage in a book or manuscript, esp in order to mislead
Interpol - police organisation
ate = knocked back (eaten)

[maxi2]

Thanks both, I was only aware of the mathematical sense of the word.