Avoid by a trick (5)
I believe the answer is:
dodge
This clue is a double definition.
'avoid' is the first definition.
(dodge can mean to avoid or evade)
'a trick' is the second definition.
(I've seen this before)
'by' acts as a link.
(Other definitions for dodge that I've seen before include "Avoid cunningly" , "Avoid by sudden move" , "Wheeze" , "Step sideways to evade" , "Avoid - Kansas city" .)