Ponders ugly stain and sticky substance (6,5)
I believe the answer is:
golden syrup
'sticky substance' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'ponders ugly stain' is the wordplay.
'ponders ugly' can be anagrammed to 'GOLDEN SYRUP'.
However, I am not sure how the anagram is indicated.
'and' acts as a link.
Can you help me to learn more?
(Other definitions for golden syrup that I've seen before include "Product of the evaporation of cane sugar juice" , "which could make for sticky situation" , "Sticky, sugary yellow foodstuff" , "Pale treacle" , "sweetener" .)