Cut one line (or more than one) (7)
I believe the answer is:
several
'more than one' is the definition.
(I've seen this before)
'cut one line' is the wordplay.
'cut' becomes 'sever' (severing is a kind of cutting**).
'one' becomes 'a'.
'line' becomes 'l'.
'sever'+'a'+'l'='SEVERAL'
'or' acts as a link.
(Other definitions for several that I've seen before include "quite a lot" , "More than one or two" , "A good few" , "Some participants" , "Divers" .)