Holes made where one possibly rubs out a line? (7)
I believe the answer is:
burrows
'holes' is the definition.
(burrow is a kind of hole)
'possibly rubs out a line?' is the wordplay.
'possibly' indicates anagramming the letters.
'out' indicates putting letters inside.
'a line?' becomes 'row' (row is a kind of line).
'rubs' anagrammed gives 'burs'.
'burs' enclosing 'row' is 'BURROWS'.
'made where one' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for burrows that I've seen before include "Rabbits' homes" , "Rabbit holes" .)