Removable boat engine (8,5)

I believe the answer is:

outboard motor

(Other definitions for outboard motor that I've seen before include "Boat power installation" , "Portable engine for use on small vessels" , "Internal-combustion engine that mounts at stern of small boat" , "Portable boat engine" , "Means of propulsion" .)

I've seen this clue in The Times and The Sunday Times.

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