Green’s Dictionary of Slang

clone n.

[SE clone, a thing produced in imitation of, or closely resembling, another]

1. (orig. US) anyone who imitates another person to a slavish extent; thus a tedious, unimportant person.

[US]C. McFadden Serial 105: He said Harvey was practically a clone.
[US]D. Jenkins Life Its Ownself (1985) 58: ‘Dede Aldwyn?’ ‘Clone.’.

2. (orig. US gay) a general description of a gay man who poses as one of a variety of super-masculine stereotypes, e.g. a truck-driver, military man, cowboy etc, a style epitomized by the members of the 1970s disco group Village People [note Gaymart.com ‘Queer Slang in the Gay 90s’ (1999): ‘In the 70’s the look included a mustache, muscle shirt/flannel shirt and Levi’s. The late 80’s–90’s included short hair, long sideburns, white t-shirt, shorts/jeans and Doc boots with gray socks’].

[US]J. Hayes in Chesebro Gayspeak 389: The greatest portion of the gay lexicon refers to gay male sexuality and associated activities: [...] clone.
[US]H. Max Gay (S)language 8: Clone—San Francisco/New York Greenwich Village gay type with exaggerated macho behavior and appearance.
[US]E. White My Lives 180: His disapproval of the American butch style didn’t keep him from being attracted to individual clones.

In compounds

clone zone (n.)

(US gay) somewhere that gay ‘clones’ associate.

[US]R. Scott Rebecca’s Dict. of Queer Sl. 🌐 clone zone — any place where clones congregate.
[shop name in Soho, London W1] Clone Zone.
[SA]K. Cage Gayle.