Young chap’s untruth about a theologian (6)

I believe the answer is:

laddie

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'young chap's untruth about a theologian' is the definition.
I can't tell whether this defines the answer.

'untruth about a theologian' is the wordplay.
'untruth' becomes 'lie' (lie is a kind of untruth).
'about' indicates putting letters inside.
'theologian' becomes 'DD' (Doctor of Divinity degree).
'a'+'dd'='add'
'lie' going around 'add' is 'LADDIE'.

Can you help me to learn more?

(Other definitions for laddie that I've seen before include "Scottish boy" , "Child" , "Youngster" , "Sonny" , "(Scots) boy" .)

I've seen this clue in The Times.

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