No longer the point (4)

I believe the answer is:

then

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

'no longer' is the definition.
Both the answer and definition are adverbs. Perhaps you can see an association between them that I don't see?

'the point' is the wordplay.
'point' becomes 'n' (N is an example).
'the'+'n'='THEN'

Can you help me to learn more?

(Other definitions for then that I've seen before include "Afterwards - as a result" , "Consequently" , "soon?" , "Subsequently - previously" , "At that time; next" .)

I've seen this clue in the Evening Standard.

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