Judge Thomas Welsh KC said: “You were convicted on the basis that you acted in a predatory manner and took advantage of a vulnerable teenager.
“The harm you have done is incalculable. “
First offender Leckie, who said he had also been drinking, claimed he had been approached by the girl and she consented to sex.
But forensic evidence corroborated the teenager’s account of events.
Leckie was also convicted of threatening and abusive behaviour towards two officers, which included racist and homophobic comments.
Defence lawyer David Taylor said Leckie was “devastated” by the verdict.
He was jailed for nine years and his name has been added to the sex offenders register indefinitely.
A non-harassment order, banning Leckie from contacting or attempting to contact the victim, was also granted.