He drives rescue vehicle into steamboat (4)

I believe the answer is:

ambo

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

'he drives rescue vehicle' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

'into steamboat' is the wordplay.
'into' indicates a hidden word.
'AMBO' can be found hidden inside 'steamboat'.

Can you help me to learn more?

(Other definitions for ambo that I've seen before include "Early Christian pulpit" , "Early form of pulpit" , "Old reading-desk" , "desk" , "Where the preacher stood" .)

I've seen this clue in the Sydney Morning Herald.

Want a hint initially instead of a full solution? Install my app