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These all the way down, as told by Stephen Hawking (7)

Flip over heartfelt rut for a passive sexual partner (6)

The mock one is a very melancholic character according to Carroll (6)

Tailless utterly strange reptile (6)

Snapper found in an overflow classroom? (6)

Old lover utterly at sea, missing honey's rear end (6)

(UTTERLY - Y)*

2nd headword in BRB, archaic: "A constant or demonstrative lover"

Terrapin flutters off without its shell (6)

(f)LUTTER(s)*

Mutant teenager initially took up recreational tobacco last Easter (6)

Badly illustrated, counterfeit Dalis binned, leaving behind e.g., Donatello (6)

ILLUSTRATED* - DALIS*; more TNMT

For National Hockey League fans of a certain age:

Number 22 in a fight: the ungallant response that Lemieux exhibits, primarily (6)

Claude Lemieux was a dirty (though extremely good) NHL player who had a habit of "turtling" when his cheap shots met with retribution.
See e.g. https://www.youtube.com/watch?v=suiwcIIHKjg [warning: heavy dose of polarizing Canadian hockey pundit Don Cherry]