Retrospective benefit for apprentice (4)

I believe the answer is:

noob

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'apprentice' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'retrospective benefit' is the wordplay.
'retrospective' is a reversal indicator.
'benefit' becomes 'boon' (a boon is a help or benefit).
'boon' written backwards gives 'NOOB'.

'for' is the link.

Can you help me to learn more?

(Other definitions for noob that I've seen before include "inexperienced person" , "novice" .)

I've seen this clue in The Guardian.

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