Crossword Genius

It's painful when sports equipment is brought over to waste facility by head girl (8)

Ross

I believe the answer is:

stabbing

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

'it's painful' is the definition.
(thesaurus)

'sports equipment is brought over to waste facility by head girl' is the wordplay.
I cannot really understand how this works, but
'girl' could be 'tabbi' and 'tabbi' is found in the answer.
This explanation may well be incorrect...

'when' is the link.

Can you help me to learn more?

(Another definition for stabbing that I've seen is " (Of pain) causing a sharp sensation".)

I've seen this clue in The Irish Times.
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