Limits of glossary concerning literary circle (4)

I haven't cracked this one yet — but the brilliant team at Times for the Times have:

G(lossar)Y + RE (concerning). Nho, so word no. 3. But gettable, if you think of (eg) gyroscope. Or remember Jabberwocky: Twas brillig, and the slithy toves Did gyre and gimble in the wabe: All mimsy were the borogoves, And the mome raths outgrabe The “literary” I think is there to suggest that the word is mainly used poetically.