New stoker aboard a boat (6)

I believe the answer is:

stroke

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

'aboard a boat' is the definition.
I can't tell whether this defines the answer.

'new stoker' is the wordplay.
'new' indicates anagramming the letters.
'stoker' with letters rearranged gives 'STROKE'.

Can you help me to learn more?

(Other definitions for stroke that I've seen before include "Rub gently" , "Medical seizure - effect of sun - oarsman" , "Brilliant achievement" , "Drive" , "Blow - gentle touch - brain damage" .)

I've seen this clue in the Evening Standard.

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