Minister is to eat about six (6)
I believe the answer is:
divine
'minister' is the definition.
(thesaurus)
'eat about six' is the wordplay.
'eat' becomes 'dine' (dining is a kind of eating).
'about' means one lot of letters goes inside another.
'six' becomes 'vi' (roman numeral).
'dine' going around 'vi' is 'DIVINE'.
'is to' acts as a link.
(Other definitions for divine that I've seen before include "Search for water with a rod" , "Theologian" , "Holy" , "Godly or celestial" , "cleric is > delightful" .)