Tech expert treasuring time with company - it leads to further service (3,4)
I believe the answer is:
net cord
'tech expert treasuring time' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.
'with company it leads to further service' is the wordplay.
'with' is an insertion indicator.
'company' becomes 'co' (abbreviation).
'it' becomes ''t' (abbreviation. e.g. in 'tis).
'leads' says to put letters next to each other (some letters go in front of others).
'to further service' becomes 'nerd' (I am not sure about this - if you are sure you should believe this answer much more).
'co' put after 't' is 'tco'.
'tco' going into 'nerd' is 'NET-CORD'.
Can you help me to learn more?
(Other definitions for net cord that I've seen before include "to Wimbledon, it's essential" , "Tennis shot" .)