Vicar of Bray perhaps less fat (7)

I haven't cracked this one yet — but the brilliant team at Times for the Times have:

From an 18th century song, the earliest version of which was entitled “The Religious Turncoat; Or, the Trimming Parson” The Vicar of Bray humorously (take my word for it or follow the link) adjusted his churchmanship and politics to suit the prevailing fashion. At a stretch, we have two definition, one by example, hence the perhaps.