Herculis

[forgetfultel]

Missing one - 18a A book binding requiring no stitching (7)
- e - f - c -

Maybe I've got something wrong. Help appreciated.

[boaw]

Perfect is the answer.

[forgetfultel]

Thanks boaw - it was the only word I could come up with, but never heard of it in that context, and never even thought to check it in the dictionary !

[frankleigh]

This was one of 6 I couldn't get. Don't get this answer. Its not in my Dictionary.