Netlike arc - rule it out (9)
I believe the answer is:
reticular
'netlike' is the definition.
(I've seen this in another clue)
'arc rule it out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'arc'+'rule'+'it'='arcruleit'
'arcruleit' is an anagram of 'RETICULAR'.
(Other definitions for reticular that I've seen before include "Netty?" , "Like net" , "forming network" , "Net-like" .)