Crossword Genius

Type of sleep those with no ambition experience (9)

Ross

I believe the answer is:

dreamless

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

'type of sleep' is the definition.
'dreamless' can be an answer for 'sleep' (I have seen 'such sleep' mean 'dreamless' so perhaps 'sleep' could also mean 'dreamless'). I am not certain of the 'type of' bit.

'those with no ambition experience' is the wordplay.
I cannot really see how this works, but
'ambition' could be 'dream' (synonyms) and 'dream' is present in the answer.
The remaining letters 'less' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for dreamless that I've seen before include "such sound sleep?" , "Lacking aspiration" , "So deep in sleep" , "Lacking any vision" .)

I've seen this clue in The Irish Times.
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