The Ireland under 21 international has agreed to join the League One outfit until January after struggling to make a breakthrough at Stamford Bridge
The Republic of Ireland under 21 international has not made a single senior appearance for the Stamford Bridge side since joining as a youth in 2007 and has already experienced loan spells at Plymouth Argyle, Yeovil Town, Notts County and Portsmouth.
Speaking about the move, the 21-year-old said that he 'couldn't wait to get out on loan' after struggling to make a breakthrough with the Champions League holders.
"I’m looking forward to getting started," he said. "I couldn’t wait to get out on loan, I was sort of stuck at Chelsea for a while.
"I just needed to get out and play some games. It’s a great club so I’m relishing the chance to get some time on the pitch," he added.
Crawley Town manager Richie Barker said that he is 'delighted' to have signed Clifford, noting that the Dubliner 'is a very good midfield player'.
"Conor is a player our management team including (Director of Football) Steve Coppell and (chief scout) Martin Hinshelwood have identified for some time," he told the club's official website. "Chelsea rate him very highly."
"He is a very good midfield player and he will add significantly to our options as we approach the busiest time of the season.
"A lot of clubs were keen to sign him on loan before the loan deadline on Thursday and we are delighted to have him with us," concluded Barker.