The term 'slapped the cuffs on' is a colloquial expression meaning to arrest someone. The two crossword solutions for this term are 'ARRESTED' (8 letters) and 'ranin' (5 letters). 'ARRESTED' is the past tense of the verb 'to arrest, ' which means to take someone into custody, usually by law enforcement. 'Ranin' is an informal term for running in, which is when a police officer runs up to someone and takes them into custody.