Lioness Mead's wager with Henry (4)

I believe the answer is:

beth

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'lioness mead's wager with henry' is the definition.
I can't tell whether this definition defines the answer.

'wager with henry' is the wordplay.
'wager' becomes 'bet' (synonyms).
'with' means one lot of letters go next to another.
'henry' becomes 'H' (symbol for the unit of electrical inductance).
'bet'+'h'='BETH'

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(Other definitions for beth that I've seen before include "Second Hebrew letter" , "Queen, either of two" , "letter to the Hebrews" , "Girl" , "Concluding stanza" .)

I've seen this clue in The Sun.

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