Crossword Genius

One never let a loony put in blank pages (10)

Ross

I believe the answer is:

interleave

'put in blank pages' is the definition.
(I've seen this before)

'one never let a loony' is the wordplay.
'one' becomes 'i' (roman numeral).
'loony' indicates an anagram.
'never'+'let'+'a'='neverleta'
'neverleta' is an anagram of 'nterleave'.
'i'+'nterleave'='INTERLEAVE'

(Other definitions for interleave that I've seen before include "put in blank pages" , "Insert between (book) pages" .)

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