Consider some text in manuscript for propriety (10)

'propriety' is the definition.
(seemliness is a kind of propriety)

'consider some text in manuscript' is the wordplay.
'consider' becomes 'see' ('see' can be a synonym of 'consider').
'some text' becomes 'line' (line is a kind of text).
'in' is an insertion indicator.
'manuscript' becomes 'mss'.
'line' inserted within 'mss' is 'mliness'.
'see'+'mliness'='SEEMLINESS'

'for' is the link.