Job on wharf ultimately insufficient for researcher (7)
I believe the answer is:
postdoc
'insufficient for researcher' is the definition.
'postdoc' can be an answer for 'researcher' (someone doing postdoctoral research). I am not sure about the 'insufficient for' bit.
'job on wharf ultimately' is the wordplay.
'job' becomes 'post' (post is a kind of job).
'on' means one lot of letters go next to another.
'wharf ultimately' becomes 'doc' (I am not sure about this - if you are sure you should believe this answer much more).
'post'+'doc'='POSTDOC'
Can you help me to learn more?
(Other definitions for postdoc that I've seen before include "Researcher" , "Someone doing advanced research" .)