Pine endlessly, coming to Cambridge city in need of company (6)
I believe the answer is:
lonely
'in need of company' is the definition.
(I've seen this in another clue)
'pine endlessly coming to cambridge city' is the wordplay.
'pine' becomes 'long' (to pine for something is to long for it).
'endlessly' means to remove the last letter.
'coming to' means one lot of letters go next to another.
'cambridge city' becomes 'ely' (I can't justify this - if you can you should believe this answer much more).
'long' with its final letter taken off is 'lon'.
'lon'+'ely'='LONELY'
Can you help me to learn more?
(Other definitions for lonely that I've seen before include "Forlorn, solitary" , "withdrawn" , "... in need of company ..." , "In want of company" , "Left" .)