Sore student mentions DIY sheaths (9)

I believe the answer is:

rawlplugs

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

'diy sheaths' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'sore student mentions' is the wordplay.
'sore' becomes 'raw' (I've seen this in another clue).
'student' becomes 'L' (as in L-plates for learner drivers).
'mentions' becomes 'plugs' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'raw'+'l'+'plugs'='RAWLPLUGS'

Can you help me to learn more?

I've seen this clue in The Independent.

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