Picture: first of abstracts with wavy lines (6)
I believe the answer is:
aliens
'picture first of abstracts with wavy' is the definition.
I can't tell whether this defines the answer.
'lines' is the wordplay.
I cannot quite see how this works, but
an anagram of 'lines' is 'liens' which is located in the answer.
A single letter 'a' remains which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for aliens that I've seen before include "Foreigners or creatures from outer space" , "Outsiders" , "'Little green men'?" , "Extra-terrestrial beings" , "Forms of life assumed to exist outside Earth" .)