Hormone That Acts in Opposition to Insulin

This page is the CodyCross answer for the clue below from Tracking Time, Group 1057, Puzzle 4 (Crystal Oscillator).

Question is: Hormone That Acts in Opposition to Insulin

and the answer is: GLUCAGON

Word Meaning:

GLUCAGON — (biochemistry) A peptide hormone, produced by the pancreas, that opposes the action of insulin by stimulating the production of sugar

Definitions from Wiktionary.