A clergyman has to eat about six (6)
I believe the answer is:
divine
'a clergyman' is the definition.
(I know that clergyman can be written as divine)
'eat about six' is the wordplay.
'eat' becomes 'dine' (to dine is to eat a meal).
'about' is an insertion indicator.
'six' becomes 'VI' (Roman numerals).
'dine' placed around 'vi' is 'DIVINE'.
'has to' is the link.
(Other definitions for divine that I've seen before include "Of or coming from God" , "cleric is > delightful" , "Sacred; delightful" , "Like a god; delightful" , "'To err is human, to forgive . . . . . .'" .)