Level on a bit too low (4)
I believe the answer is:
flat
'low' is the definition.
(I've seen this before)
'level on a bit too' is the wordplay.
'level' becomes 'fla' (I can't justify this - if you can you should give a lot more credence to this answer).
'on' says to put letters next to each other (in a down clue, letters appear on others).
'a bit' suggests taking the first letters (I've seen 'a bit of' mean this).
The initial letter of 'too' is 't'.
'fla'+'t'='FLAT'
Can you help me to learn more?
(Other definitions for flat that I've seen before include "No longer charged" , "like some races" , "Apartment; plane" , "rooms exactly" , "Apartment - below the note" .)