Filter Slowly Through a Porous Surface
This page is the CodyCross answer for the clue below from London, Group 492, Puzzle 1 (Big Ben Clock).
Question is: Filter Slowly Through a Porous Surface
and the answer is: PERCOLATE
Word Meaning:
PERCOLATE — (transitive) To pass a liquid through a porous substance; to filter.
Definitions from Wiktionary.