Part of church beginning to leak -- something contemplated? (5)
I believe the answer is:
navel
'something contemplated?' is the definition.
(contemplate one's navel)
'part of church beginning to leak' is the wordplay.
'part of church' becomes 'nave' ('nave' is part of 'church').
'beginning to' says to take the initial letters.
The initial letter of 'leak' is 'l'.
'nave'+'l'='NAVEL'
(Other definitions for navel that I've seen before include "for contemplation" , "Scar on the stomach (for gazing at?)" , "Where the umbilical cord was once attached" , "regarded with complacency" , "Umbilicus" .)