Crossword Genius

Header against the post? (7)

Ross

I believe the answer is:

hashtag

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If this is the answer I cannot explain how the clue works.

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(Other definitions for hashtag that I've seen before include "Number symbol" , "Twitter mark" , "Label on a tweet" , "Symbol used to indicate the subject of a Twitter message" , "Social media identifier" .)

I've seen this clue in The Times.
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