One cuts line in various places (7)
I believe the answer is:
scalpel
'one cuts line in various places' is the definition.
I can't tell whether this definition defines the answer.
'line in various places' is the wordplay.
'line' becomes 'l' (used when specifying particular lines from a poem).
'in' indicates putting letters inside.
'various' indicates anagramming the letters.
'places' with letters rearranged gives 'scapel'.
'l' put within 'scapel' is 'SCALPEL'.
Can you help me to learn more?
(Other definitions for scalpel that I've seen before include "sharp knife" , "Sharp blade" , "Operator may use this" , "Surgeon's blade" , "One making cuts in hospital" .)