Pudding right for one who is not serious (7)

I believe the answer is:

trifler

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'one who is not serious' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'pudding right' is the wordplay.
'pudding' becomes 'trifle' (type of pudding).
'right' becomes 'r' (common abbreviation).
'trifle'+'r'='TRIFLER'

'for' is the link.

Can you help me to learn more?

(Other definitions for trifler that I've seen before include "Idler" , "One behaving without seriousness" .)

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