Islamic fast (7)
I believe the answer is:
ramadan
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">islamic fast</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for ramadan that I've seen before include "Muslim holy month" , "Religious festival" , "The penitential ninth month of the Muslim year" , "Muslim period of fasting" , "Islamic month (of fasting)" .)