Sort of job having no lively conclusion (4-3)

I believe the answer is:

dead-end

I'm a little stuck... Click here to teach me more about this clue!

'sort of job' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'no lively conclusion' is the wordplay.
'no lively' becomes 'dead' (I can't explain this - if you can you should believe this answer much more).
'conclusion' becomes 'end' (something's conclusion is its end).
'dead'+'end'='DEAD-END'

'having' acts as a link.

Can you help me to learn more?

I've seen this clue in The Globe and Mail.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.