The most common and most likely answer to this crossword clue is the 10 letter word THEOLOGIAN
I've seen this crossword clue in The Times
T
H
E
O
L
O
G
I
A
N
More clues leading to the result THEOLOGIAN
- Goliath, one troubling student of religion
- DD is one goliath bust!
- Scholar thus comprehending old sayings of Christ
- Divine articles about old inconclusive reasoning
- Doctor heating loo? That’s divine!
- The topless ladies’ man turned up with an ecclesiastical scholar
- Articles about logo designed by Indian minister
Buddy explains!

The straight part
We know that "DD" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case dd = theologian.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does THEOLOGIAN mean?
THEOLOGIAN noun- One who studies theology.
- In Roman Catholic usage, a theological lecturer attached to a cathedral church.