It's a relative clause with the pronoun suppressed: It's a fine doctor who/that would have his parlour full of hedgehogs and mice!". I wouldn't say it was acceptable in current speech, but it occurs quite a lot in old texts. This omitted relative pronoun occurs (i.e. doesn't occur) in the fossil:
'Tis an ill wind blows nobody any good.
This is usually sanitized, with a "that", but I've found it on this Gaelic site: 200+ seanfhocal . As the site is obviously for Gaelic speakers though, it's possible that this suppressed relative pronoun mimics Gaelic syntax; I really don't know - though it's familiar in some Irish folk lyrics: e.g. 'There was an old woman from Wexford/In Wexford town did dwell'.
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