A theologian will produce more (3)

I believe the answer is:

add

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'a theologian will produce more' is the definition.
I can't judge whether this defines the answer.

'a theologian' is the wordplay.
'theologian' becomes 'DD' (Doctor of Divinity degree).
'a'+'dd'='ADD'

Can you help me to learn more?

(Other definitions for add that I've seen before include "Sum, total" , "Aggregate or supplement" , "Go further" , "Give more" , "Put together - attach" .)

I've seen this clue in The Irish News.

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