There's no rush. That will mean prison for years (4,2,4)

I believe the answer is:

lots of time

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

'there's no rush that will' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'prison for years' is the wordplay.
'prison' becomes 'time' (as in a spell in prison).
'for' is a charade indicator (letters next to each other) (I've seen this in other clues).
'years' becomes 'lotsof' (I can't explain this - if you can you should believe this answer much more).
'time' after 'lotsof' is 'LOTS OF TIME'.

'mean' is the link.

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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