Dull work may come to an end (8)

I believe the answer is:

flatline

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'come to an end' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'dull work' is the wordplay.
'dull' becomes 'flat' (similar in meaning).
'work' becomes 'line' (line can mean someone's profession or work).
'flat'+'line'='FLATLINE'

'may' is the link.

Can you help me to learn more?

(Another definition for flatline that I've seen is " show no sign of life".)

I've seen this clue in The Guardian.

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