A trick to avoid (5)
I believe the answer is:
dodge
This clue is a double definition.
'a trick' is the first definition.
(I've seen this before)
'avoid' is the second definition.
(dodge can mean to avoid or evade)
'to' is the link.
(Other definitions for dodge that I've seen before include "Avoid - ruse" , "Evasion" , "Sidestep with trick?" , "Cunning move" , "Avoid or attempt to" .)