Glutton blocking toilets ruined cover for pipe (10)
I believe the answer is:
epiglottis
'cover for pipe' is the definition.
(cover for the windpipe)
'glutton blocking toilets ruined' is the wordplay.
'glutton' becomes 'pig' (I've seen this in other clues).
'blocking' indicates putting letters inside.
'ruined' indicates anagramming the letters.
'toilets' with letters rearranged gives 'elottis'.
'pig' placed within 'elottis' is 'EPIGLOTTIS'.
(Other definitions for epiglottis that I've seen before include "Thin flap in the throat" , "stop for a breather" .)