"Scrive" is a Lallans word meaing to scratch or mark or to write easily and copiously or a piece of writing. However, whether this word can have "de" placed in front of it who knows?

"Describe" in Lallans is "descrieve" (this is a dialectic spelling).

With Burns he sometimes seems to be a law unto himself liguistically. Neither really fits well, but that is the beauty of poetic license....