Crossword Genius

A number backing World War II alliance (4)

Ross

I believe the answer is:

axis

'world war ii alliance' is the definition.
(I've seen this in another clue)

'a number backing' is the wordplay.
'number' becomes 'six' (six is a kind of whole number).
'backing' is a reversal indicator.
'six' back-to-front is 'xis'.
'a'+'xis'='AXIS'

(Other definitions for axis that I've seen before include "Spotted deer" , "Fixed line in revolution" , "league" , "WW2 Nazi alliance" , "Line about which a body turns or a construction is symmetrical" .)

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