There have been many clues in the past episodes that Wren is A!
As you all know the big A reveal is a couple episodes away!
Marlene tweeted that A's gender is a girl so it is pretty unlikely that Wren is 'Uber A'.
In Season 2 there is an A message written on the wall that says "Nosey Bitches Die" The A message says Nosey which is how British people spell it.
In the end of Season 5 there was an A clue that pointed towards Wren .A person in a black hoodie was holding a WRENch. Most of the word wrench is Wren so it might be a sign that he is on the -A team.
Marlene posted a picture of the little boy that was acting out a 'baby' Charles in the Season 5 finale. The little boy was holding an apple and the caption that Marlene posted was: "An apple a day..." Now if you continued the saying it would be "An apple a day keeps the doctor away." I think this is a big hint that marlene posted.

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Big -A Theory
Fiksi PenggemarThis theory starts after the Pretty Little Liars christmas episode ( 5x13 ). I will continue to update it as new episodes give more clues :)! The theory's included are: Maya being big -A, wren being big -A, Cece being big -A , and possibly more thr...