Tries out flags (5)
I believe the answer is:
tires
'flags' is the definition.
(I've seen this in another clue)
'tries out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'tries' is an anagram of 'TIRES'.
(Other definitions for tires that I've seen before include "Exhausts" , "Wearies" , "Becomes weary and in need of rest" , "Grows weary of rites" , "Weakens" .)