Shop has rye bread replaced - bit of hair stuck in it (12)
I believe the answer is:
haberdashery
'shop' is the definition.
(haberdashery is a kind of shop)
'has rye bread replaced bit of hair stuck in it' is the wordplay.
'replaced' is an anagram indicator.
'bit of' says to take the initial letters.
'stuck in it' is an insertion indicator.
The first letter of 'hair' is 'h'.
'has'+'rye'+'bread'='hasryebread'
'hasryebread' is an anagram of 'haberdasery'.
'haberdasery' placed around 'h' is 'HABERDASHERY'.
(Other definitions for haberdashery that I've seen before include "Buttons, thread, etc." , "Buttons and bows etc" , "Sewing accessories" , "shop" , "US outfitter" .)