One disregards nursing books instructor initially selects (10)
I believe the answer is:
identifies
'selects' is the definition.
(identify can mean to pick or select)
'one disregards nursing books instructor initially' is the wordplay.
'one' becomes 'I' (Roman numeral).
'disregards' becomes 'defies'.
'nursing' is an insertion indicator.
'books' becomes 'nt' (abbreviation for New Testament).
'initially' suggests taking the first letters.
The initial letter of 'instructor' is 'i'.
'nt'+'i'='nti'
'defies' placed around 'nti' is 'dentifies'.
'i'+'dentifies'='IDENTIFIES'
(Another definition for identifies that I've seen is " fingers".)