Avoidance so naive in a way (7)
I believe the answer is:
evasion
'avoidance' is the definition.
(I've seen this before)
'so naive in a way' is the wordplay.
'in a way' indicates an anagram.
'so'+'naive'='sonaive'
'sonaive' with letters rearranged gives 'EVASION'.
(Other definitions for evasion that I've seen before include "The act of dodging the issue." , "Dodging of responsibility etc" , "attempt to withhold truth?" , "Cunning" , "prevaricating excuse" .)