Crossword Genius

Revolutionary books, all there at the borders (10)

Ross

I believe the answer is:

rotational

'revolutionary' is the definition.

'books all there at the borders' is the wordplay.
'books' becomes 'ot' (Old Testament).
'all there' becomes 'rational' (as 'not all there' can mean irrational).
'at the borders' is an insertion indicator.
'ot' inserted inside 'rational' is 'ROTATIONAL'.

(Another definition for rotational that I've seen is " going round".)

I've seen this clue in The Times.
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