Percolate in Meadow Church? (5)
I believe the answer is:
leach
'percolate' is the definition.
(I know that percolate can be written as leach)
'meadow church?' is the wordplay.
'meadow' becomes 'lea' (a lea is a grassy area).
'church?' becomes 'ch' (common abbreviation).
'lea'+'ch'='LEACH'
'in' is the link.
(Other definitions for leach that I've seen before include "Make liquid percolate through a solid" , "Remove (soluble material) by percolation" , "Percolate through soil or ore" , "Drain away through percolating liquid" , "Filtrate" .)