Church tax (5)
I believe the answer is:
tithe
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">church tax</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for tithe that I've seen before include "Offering" , "Levy by church, e.g." , "Levy of one tenth of something" , "Tax paid to church" , "Former church tax" .)