I knew it had to be Dr Who-related! I went wrong in thinking of Melody Pond rather than Amy Pond.

Cause of legendary textile injury to actively dispel absorbing nitrogen (7)

Nay, it is not element.

Cause of legendary textile injury to actively dispel absorbing nitrogen (7)

__i____

No, not brittle.

Cause of legendary textile injury to actively dispel absorbing nitrogen (7)

__i___e

Note that it’s legendary.

[anagrind] {fodder} [containment indicator] [abbr]

Cause of legendary textile injury to actively dispel absorbing nitrogen (7)

__i__le

[anagrind] {fodder} [containment indicator] [abbr]

The poor victim of the injury wasn’t the only one to suffer; somehow everyone in the vicinity ended up with the same symptoms. At least the victim didn’t die, and it all ended happily.