Marsha rebuilt Hindu retreat (6)
I believe the answer is:
ashram
'hindu retreat' is the definition.
(I've seen this before)
'marsha rebuilt' is the wordplay.
'rebuilt' is an anagram indicator.
'marsha' is an anagram of 'ASHRAM'.
(Other definitions for ashram that I've seen before include "Place of religious retreat for Hindus" , "Hindu retreat location" , "spiritual centre?" , "Place for religious retreat (in India)" , "holy man's retreat" .)