Runs in a false retreat (6)
I believe the answer is:
ashram
'retreat' is the definition.
(I've seen this before)
'runs in a false' is the wordplay.
'runs' becomes 'r' (cricket abbreviation).
'in' means one lot of letters goes inside another.
'false' becomes 'sham' (I've seen this before).
'a'+'sham'='asham'
'r' inserted inside 'asham' is 'ASHRAM'.
(Other definitions for ashram that I've seen before include "Indian religious retreat" , "religious community" , "Guru's community" , "Hindu retreat house" , "Place for religious retreat (in India)" .)