Miserable dwelling with no floor for holy man (5)
I believe the answer is:
sadhu
'for holy man' is the definition.
(I've seen this before)
'miserable dwelling with no floor' is the wordplay.
'miserable' becomes 'sad' (similar in meaning).
'dwelling' becomes 'hut' (I have seen 'Crude dwelling ' mean 'hut' so perhaps 'dwelling' could also mean 'hut').
'with no floor' means to remove the last letter (the letter at the bottom of the word is removed).
'hut' with its final letter taken away is 'hu'.
'sad'+'hu'='SADHU'
(Other definitions for sadhu that I've seen before include "Indian wandering holy man" , "Hindu wandering holy man" , "Indian holy man or sage" , "one choosing austerity" , "Ascetic" .)