Home of slightly boring headwear (7)
I believe the answer is:
habitat
'home' is the definition.
(I know that home can be written as habitat)
'slightly boring headwear' is the wordplay.
'slightly' becomes 'a bit' ('a bit' can mean 'slightly' or 'somewhat').
'boring' is an insertion indicator (to bore something can mean to drill into it).
'headwear' becomes 'hat' (hat is a type of headwear).
'abit' going inside 'hat' is 'HABITAT'.
'of' is the link.
(Other definitions for habitat that I've seen before include "Animal's environment" , "Bath at 1? (anag)" , "place haunted" , "One's normal environment" , "(Organism's) natural home" .)