Be obliged to keep line significantly cut (5)
I believe the answer is:
halve
'be obliged' is the definition.
I can't tell whether this definition defines the answer.
'keep line significantly cut' is the wordplay.
'keep' becomes 'have' (I've seen this in other clues).
'line significantly' becomes 'l' (I am not sure about the 'significantly' bit.**).
'cut' means one lot of letters goes inside another (some letters have cut into others).
'have' placed around 'l' is 'HALVE'.
'to' is the link.
Can you help me to learn more?
(Other definitions for halve that I've seen before include "split with another" , "cut by fifty percent" , "Divide equally between two" , "make 10 5 say?" , "Divide into two equal pieces" .)