Doorway with no steps suitable for newcomers (5-5)
I believe the answer is:
entry-level
'steps suitable for newcomers' is the definition.
I don't know anything about this answer so I cannot tell whether this works.
'doorway with no' is the wordplay.
'doorway' becomes 'entry' (synonyms).
'with no' becomes 'level' (I can't explain this - if you can you should give a lot more credence to this answer).
'entry'+'level'='ENTRY-LEVEL'
Can you help me to learn more?
(Other definitions for entry-level that I've seen before include "Simple enough for a beginner" , "Suitable for beginners" .)