Christopher Langmuir clears up my confusion
about verbs in John Clare's poem Emmonsails Heath in Winter
Regarding John Clare's seemingly wayward verbal morphology, it is perhaps pertinent to point out that one of the most salient features of his dialect, East Anglian, is a zero marking for the 3rd person singular, which I imagine he uses as often as it suits him [see Fisiak, Jacek, and Peter Trudgill, ed. (2001) East Anglian English. D. S. Brewer, xii+264pp, hardback ISBN 0-85991].
I wish I could claim credit for the blog post title, but that too is Christopher's, from the subject line of his email.