The 32-year-old actor is expected to receive a community sentence after being found guilty of harassing his former co-star last month.
The Bafta-winning actor, of Bethnal Green, east London, was found to have posted hundreds of messages on social media about the Star Trek into Darkness star between 5 March and 19 December last year.
Deacon, 32, subjected Mr Clarke to a “barrage of abuse” Hammersmith Magistrates’ Court in London heard last month.
Londoner Deacon, famous for his rapid-fire patois, won his first break playing troubled teenager Jay in Kidulthood, a film written by Mr Clarke.
He last appeared on TV screens as Robbie, an unstable Met Police firearms officer in Danny Boyle’s satirical police drama, Babylon, featuring James Nesbitt.
The pair acted alongside each other in the film, which told the story of youths growing up on London’s most deprived estates.
Deacon and Mr Clarke fell out over Deacon’s 2011 directing debut Anuvahood, which netted him a BAFTA Rising Star award. Clarke claimed it infringed on the copyrights of his films.