Sulphur is found in eggs and wine (4)
I believe the answer is:
rose
'wine' is the definition.
(I've seen this before)
'sulphur is found in eggs' is the wordplay.
'sulphur' becomes 's' ('S' can be a synonym of 'sulphur').
'is found in' indicates putting letters inside.
'eggs' becomes 'roe' (I've seen this before).
's' placed inside 'roe' is 'ROSE'.
'and' is the link.
(Other definitions for rose that I've seen before include "Old song 'The last . . . of summer'" , "Prickly shrub with bright flowers" , "Flower; increased" , "Pinkish wine" , "moved from seat?" .)