Muslim month of fasting (7)
I believe the answer is:
ramadan
'muslim month of fasting' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for ramadan that I've seen before include "Muslim period of fasting" , "Islamic fast" , "lunar month" , "Ninth month of Muslim year, a time of fasting" , "Moslem fast" .)