You being laid in earth was excessively sickening (6)
I believe the answer is:
cloyed
'was excessively sickening' is the definition.
(to cloy is to be disgustingly sweet)
'you being laid in earth' is the wordplay.
'you' becomes 'ye' (historical version of 'you').
'being laid in' means one lot of letters goes inside another.
'earth' becomes 'clod' (a clod is a lump of earth).
'ye' going within 'clod' is 'CLOYED'.
(Other definitions for cloyed that I've seen before include "Sickened by glutting with sweet things" , "Was cause of weariness" , "Was excessively sweet or sentimental" .)