Clergyman's a bit of a booby, possibly dropping a tablet (6)

I believe the answer is:

father

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'clergyman's' is the definition.
(Father is an example)

I cannot understand how the remainder of the clue works.

(Other definitions for father that I've seen before include "PA" , "and 13: Jolly gift-deliverer" , "Old man" , "The - of the House is the longest-serving MP" , "family member" .)

I've seen this clue in The Independent.

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