One coming inside stumbles around in shade (6)
I believe the answer is:
spirit
This might be a double definition.
'one coming inside stumbles around' is the first definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'shade' is the second definition.
(I have seen 'A shade' mean 'spirit' so perhaps 'shade' could also mean 'spirit')
'in' is the link.
(Other definitions for spirit that I've seen before include "Possibly a rum" , "Life-force" , "Scotch, maybe" , "Life force" , "Eg, rum" .)