Uses fishy lines of approach? (6)
I believe the answer is:
angles
'uses' is the definition.
The definition and answer can be both to do with contact as well as being verbs in their -s form.
Perhaps you can see a link between them that I can't see?
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for angles that I've seen before include "Spaces between lines that meet" , "old Germanic tribespeople" , "those who met Pope Gregory" , "Ways of approaching" , "They may be acute, obtuse or right" .)