Religious woman finding some clergyman unready (3)
I believe the answer is:
nun
'religious woman' is the definition.
(woman who has taken religious vows)
'some clergyman unready' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'NUN' is hidden in the letters of 'clergyman unready'.
'finding' is the link.
(Other definitions for nun that I've seen before include "eg Carmelite" , "Domestic fancy pigeon" , "Convent resident" , "Priory female" , "Fancy pigeon variety" .)