Possible Clues:

• Cut through section, keeping dry
• Split dry piece outside
• Split a trifle with dry inside
• Divide according to religious affiliation, as announced
• Bishop leading one part of church split in two
• 27 across, by the sound of a religious body
• Cut in half making second separate portion
• Divide group chasing sound purchase
• Cut halfway through
• Halve a little over 28 part one