Finished with a terrible need for a bit of aid (5)
I believe the answer is:
ended
'finished' is the definition.
('end' can be a synonym of 'finish')
'a terrible need for a bit of aid' is the wordplay.
'a terrible' indicates an anagram.
'for' says to put letters next to each other.
'a bit of aid' becomes 'd' (I can't explain this - if you can you should believe this answer much more).
'need' anagrammed gives 'ende'.
'ende'+'d'='ENDED'
'with' is the link.
Can you help me to learn more?
(Other definitions for ended that I've seen before include "died" , "Having come to a conclusion" , "Brought to a close" , "Concluded" , "Acclaim" .)