Sticky substance in bottom of pot on variety of cereal (7)
I believe the answer is:
treacle
'sticky substance' is the definition.
(I've seen this before)
'bottom of pot on variety of cereal' is the wordplay.
'bottom of' says to take the final letters.
'on' says to put letters next to each other.
'variety of' indicates an anagram.
The last letter of 'pot' is 't'.
'cereal' with letters rearranged gives 'reacle'.
't'+'reacle'='TREACLE'
'in' is the link.
(Other definitions for treacle that I've seen before include "Something cloyingly sweet" , "Carroll's sisters had to live with" , "cloying stuff" , "Thick syrup from sugar cane" , "Something sticky" .)