Crossword Genius

Group develop core tool for onboarding? (9)

Ross

I believe the answer is:

gangplank

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

'group develop core' is the definition.
I can't judge whether this definition defines the answer.

'tool for onboarding?' is the wordplay.
'tool' becomes 'gang' (gang is a kind of tool).
'for' is a charade indicator (letters next to each other).
'onboarding?' becomes 'plank' (I can't explain this - if you can you should believe this answer much more).
'gang'+'plank'='GANGPLANK'

Can you help me to learn more?

(Other definitions for gangplank that I've seen before include "way of leaving Britannia?" , "Way on to ship" , "Boarding bridge" , "Pirates made people walk it" , "way to get on board" .)

I've seen this clue in The Times.
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