Hindu deity, Hebrew tribe, Muslim fast (7)
I believe the answer is:
ramadan
'muslim fast' is the definition.
(I've seen this in another clue)
'hindu deity hebrew tribe' is the wordplay.
'hindu deity' becomes 'rama' (Rama is an example).
'hebrew tribe' becomes 'dan' (one of the Tribes of Israel. I am not sure about the 'hebrew' bit.).
'rama'+'dan'='RAMADAN'
Can you help me to learn more?
(Other definitions for ramadan that I've seen before include "Muslim month of fasting from sunrise to sunset" , "Ninth month of Muslim year, a time of fasting" , "Moslem fast" , "lunar month" , "Islamic month (of fasting)" .)