Is there only one clue at 14, either Down or Across because if you have both, then you should indicate which.
I once wrote a clue Lionheart that incorporated another entry and didn't realise that that entry was the start of both a Down clue and an Across clue which looked a bit unprofessional and I got questioned on it. If only one clue starts at 14, then it should be ok to just put the number