In the auction, theologian got something for horse (6)
I believe the answer is:
saddle
'for horse' is the definition.
(saddle horse is a kind of horse)
'in the auction theologian' is the wordplay.
'in the' indicates putting letters inside.
'auction' becomes 'sale' (I've seen this in other clues).
'theologian' becomes 'DD' (Doctor of Divinity degree).
'sale' going around 'dd' is 'SADDLE'.
'got something' acts as a link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for saddle that I've seen before include "Cut of meat" , "Rider's seat" , "Seat for a rider, horse or bike" , "Lumber (with); one on horse" , "A horseman's seat" .)