Sailor in boat a rascal (3)

I believe the answer is:

tar

'sailor' is the definition.
(slang term for a sailor)

'in boat a rascal' is the wordplay.
'in' indicates the answer is hidden within the clue.
'TAR' can be found hidden inside 'boat a rascal'.

(Other definitions for tar that I've seen before include "Cigarette substance" , "prepare for feathers?" , "Viscous liquid; sailor" , "Familiar sailor - what a rat" , "Viscous bituminous substance" .)

I've seen this clue in The Sun.

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