Being mean is pointless so now become generous (6)

I believe the answer is:

lavish

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

'generous' is the definition.
(similar in meaning)

'being mean is pointless so now' is the wordplay.
I cannot quite see how this works, but
'is' is found in the answer.
This explanation may well be incorrect...

'become' is the link.

Can you help me to learn more?

(Other definitions for lavish that I've seen before include "Prodigal - unrestrained" , "Splendid" , "Squander" , "Extravagant or excessive" , "Plentiful or munificent" .)

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

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