Clues go pear-shaped, sugar (7)
I believe the answer is:
glucose
'sugar' is the definition.
(type of sugar)
'clues go pear-shaped' is the wordplay.
'clues go' can be anagrammed to 'GLUCOSE'.
However, I'm unsure how this is indicated.
Can you help me to learn more?
(Other definitions for glucose that I've seen before include "Naturally occurring sugar" , "syrupy stuff" , "Sweet substance" , "something tasting sweet" , "Form of sugar found in fruit etc" .)