Clagett was baptised at Canterbury on 16 December 1610, and in 1628 entered Merton College, Oxford, where he proceeded B.A.
[1][2] About 1636 Clagett became vicar of St Michael with St Mary's Church, Melbourne, Derbyshire and about 1644 he was chosen lecturer or preacher at St. Mary's Church, Bury St. Edmunds, Suffolk, where he was popular with the "precise party".
[1] Clagett wrote: The Abuse of God's Grace; discovered in the Kinds, Causes, Punishments, Symptoms, Cures, Differences, Cautions, and other Practical Improvements thereof.
Proposed as a seasonable check to the wanton Libertinisme of the present Age, Oxford, 1659.
It was dedicated to his "honoured cousin" William Clagot, and his "dear consort" the Lady Southcote.