At home like middle of doors to show colour (6)
I believe the answer is:
indigo
'colour' is the definition.
(indigo is a kind of colour)
'at home like middle of doors' is the wordplay.
'at home' becomes 'in' ('in' can be similar in meaning to 'at home').
'like' becomes 'dig' (I've seen this in other clues).
'middle of' means to look at the middle letters.
The central letter of 'doors' is 'o'.
'in'+'dig'+'o'='INDIGO'
'to show' is the link.
(Other definitions for indigo that I've seen before include "Violet dye" , "Tropical plant" , "supplier of blue stuff" , "One of the colours of the rainbow" , "Adulthood" .)