Bone broken by Lorenzo, say, requiring adoption of current stress-related science (11)

'stress-related science' is the definition.
(biomedicine is a science)

'bone broken by lorenzo say requiring adoption of current' is the wordplay.
'broken by' is an insertion indicator.
'lorenzo say' becomes 'Medici' (15th-century politician Lorenzo de' Medici).
'requiring adoption of' is an insertion indicator (inserted letters are adopted by others).
'current' becomes 'I' (symbol for electric current).
'bone' placed around 'medici' is 'bomedicine'.
'bomedicine' going around 'i' is 'BIOMEDICINE'.