Six-footer to be left with Bible in AA (5)

I believe the answer is:

larva

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'six-footer' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'left with bible in aa' is the wordplay.
'left with' becomes 'l' (common abbreviation. I am not sure about the 'with' bit.).
'bible' becomes 'rv' (Revised Version, revision of King James Bible).
'in' is an insertion indicator.
'rv' inserted into 'aa' is 'arva'.
'l'+'arva'='LARVA'

'to be' is the link.

Can you help me to learn more?

(Other definitions for larva that I've seen before include "Insect just out of egg" , "shows form of immaturity" , "Early stage of creature" , "Insect's immature form" , "Caterpillar, for example" .)

I've seen this clue in The Telegraph and The Sun.

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