'The will of Richard Buckland, made 24 Aug. 1558, ... to daughter Bridget Buckland, ... she not to marry William or Anthony Overton of any of their brothers, sons of Goodlake Overton, late of St. John's Street, Gent., deceased ...'
'The issue of Guthlac and Olive Overton were: ... Anthony; in Dec. 1539 one Anthony Overton was styled late a monk at Croyland, Lincs. [L & P, H VIII, passim].'
Presumably 'late a monk' means that he had recently been a monk at Croyland but no longer was, especially since he was apparently still living in 1558. However, it is also possible that Richard Buckland confused the names of Guthlake's sons in his will and he meant Clement or Harry (one of the younger sons, more likely to have been unmarried in 1558). Note that Anthony is not mentioned in his mother's 1545 will, suggesting he had died by then, so possibly 'late a monk' means that he had died by Dec 1539. Of course, it is also possible that the Anthony Overton referred to in Dec 1539 was not the son of Guthlac Overton.