Hint Jack is being hidden up by the clergyman (6)
I believe the answer is:
curate
'the clergyman' is the definition.
(curate is a kind of clergyman)
'hint jack is being hidden up' is the wordplay.
I cannot really understand how this works, but
'being' could be 'rat' (rat is a kind of being) and 'rat' is found within the answer.
'hint' could be 'cue' (I've seen this in another clue) and 'cue' is found in the remaining letters.
This accounts for all the letters.
This explanation may well be incorrect...
'by' is the link.
Can you help me to learn more?
(Other definitions for curate that I've seen before include "A truce (anag)" , "assistant barman in Ireland" , "Church of England clergyman" , "Organize a museum or exhibition" , "Clergyman assisting a vicar" .)