Crossword Genius

Fight battle at the end in Book of Revelation? (5)

Ross

I believe the answer is:

spare

I'm a little stuck... Click here to teach me more about this clue!

'book of revelation?' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'fight battle at the end' is the wordplay.
'fight' becomes 'spar' (sparring is a kind of fighting).
'at the end' suggests the final letters.
The last letter of 'battle' is 'e'.
'spar'+'e'='SPARE'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for spare that I've seen before include "Let off; extra" , "Lean and treat mercifully" , "Pardon; unneeded" , "A feature of trousers" , "Additional; thin" .)

I've seen this clue in The Guardian.
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