Seeks one's help first in getting the faulty lens out (7)
I believe the answer is:
enlists
'seeks' is the definition.
The answer and definition can be both to do with ownership as well as being verbs in their -s form.
Maybe they are linked in a way I don't understand?
'one's help first in getting the faulty lens out' is the wordplay.
'one's' becomes 'I's' (Roman numeral).
'help first in' becomes 't' (I am not sure about this - if you are sure you should believe this answer much more).
'getting' means one lot of letters go next to another.
'the faulty' indicates anagramming the letters.
'out' means one lot of letters goes inside another.
'lens' is an anagram of 'enls'.
'is'+'t'='ist'
'ist' inserted inside 'enls' is 'ENLISTS'.
Can you help me to learn more?
(Other definitions for enlists that I've seen before include "Registers" , "Joins up" , "Listens (anag.)" , "volunteers" , "Recruits" .)