Bhiodh a' chuthag 's an smùdan a' gabhail ciùil duinn air chrannaibh.

What is the translation of smúdan in this context?

Thanks!

Dwelly's gives two sets of meanings. The first is a kiln or the smoke from a fire, especially a signal fire, but the second seems to fit your sentence much better: the "musical note of any singing bird" or a "wood pigeon" or a "turtle [dove?]".

_________________
I'm not a native (or entirely fluent) speaker, so be sure to wait for confirmations/corrections, especially for tattoos.

Thanks!