Crossword Genius

Form of transport like a small ship (3)

Ross

I believe the answer is:

ass

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

'form of transport' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'a small ship' is the wordplay.
'small ship' becomes 'ss' (this might be a standard abbreviation I've not previously seen).
'a'+'ss'='ASS'

'like' is the link.

Can you help me to learn more?

(Other definitions for ass that I've seen before include "Donkey or foolish person" , "Pompous fool or beast of burden" , "Clot" , "Horse hybrid" , "Dolt" .)

I've seen this clue in The Globe and Mail.
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