Thwart, Obstruct, Foil
This page is the CodyCross answer for the clue below from Concert Hall, Group 593, Puzzle 5 (Woodwinds and Brass).
Question is: Thwart, Obstruct, Foil
and the answer is: FRUSTRATE
Word Meaning:
FRUSTRATE — (transitive) To disappoint or defeat; to vex by depriving of something expected or desired.
Definitions from Wiktionary.