Maintenance cost (6)
I believe the answer is:
upkeep
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">maintenance cost</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for upkeep that I've seen before include "Peek up at the maintenance" , "payments?" , "Cost of maintaining" , "Maintenance costs" , "Cost of support" .)