Related Clues:
- Stick a cat in a hat up here
- Stick a teetotaller on the start of 13 across
- Hook up with a non-drinker, alas in Berlin
- Attach a really loud 1-across?
- Add-on to the start or end of a word stem (as in 17-, 25-, 35-, 49- and 57-Across)
- Append return of 'The Cat in the Hat', perhaps
- Fix to short handlebar, say
- Join in a fortissimo number
- Fasten - assign
- Fasten - attribute
- Join onto
- Join in a very loud number
- Add to an e-mail, as a file
- Send with an email
- Pin, say