Once again put in bookstand sailors left behind (conserved by Oliver in film) (2-7)
I believe the answer is:
re-elected
'bookstand sailors left behind conserved by oliver in film' is the definition.
I can't judge whether this definition defines the answer.
'once again put in' is the wordplay.
'once again' becomes 're' (prefix in verbs).
'put in' becomes 'elected' (I've seen this in another clue).
're'+'elected'='RE-ELECTED'
Can you help me to learn more?
(Other definitions for re-elected that I've seen before include "Voted back into office" , "Chosen to represent once more" .)