Coming out is hard to understand (6)
I believe the answer is:
gnomic
'hard to understand' is the definition.
(gnomic can mean cryptic or enigmatic)
'coming out' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'coming' anagrammed gives 'GNOMIC'.
'is' is the link.
(Other definitions for gnomic that I've seen before include "Cryptic sort of expression" , "Expressed in short, witty aphorisms" , "pithy remark" , "Enigmatic; ambiguous" , "Sententious, aphoristic" .)