I forgo debt in difficulties — something that may cross a line (10)
I believe the answer is:
footbridge
'something that may cross a line' is the definition.
(a footbridge may cross a railway line)
'i forgo debt in difficulties' is the wordplay.
'in difficulties' indicates an anagram (I've seen this in other clues).
'i'+'forgo'+'debt'='iforgodebt'
'iforgodebt' with letters rearranged gives 'FOOTBRIDGE'.
(Other definitions for footbridge that I've seen before include "walkway" , "Over which one may walk" , "Pedestrian crossing, as it were" , "unsuitable for the motorist?" .)