The last theologian may end in back current (4)

I believe the answer is:

eddy

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'back current' is the definition.
'eddy' can be an answer for 'current' (I've seen this before). I'm not sure about the 'back' bit.

'the last theologian may end' is the wordplay.
'last' suggests the final letters.
'theologian' becomes 'DD' (Doctor of Divinity degree).
'end' suggests the final letters.
The last letter of 'the' is 'e'.
The final letter of 'may' is 'y'.
'e'+'dd'+'y'='EDDY'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for eddy that I've seen before include "Christian Scientist" , "Circular movement of air" , "Religious woman" , "She founded Christian Science in 1866, d. 1910" , "current running back" .)

I've seen this clue in the Sydney Morning Herald.

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