Was unaware of breaking step going round the corner (5)
I believe the answer is:
slept
'was unaware' is the definition.
I can't tell whether this definition defines the answer.
'breaking step going round the corner' is the wordplay.
'breaking' is an insertion indicator.
'going round' indicates anagramming the letters.
'the corner' becomes 'l' (I can't explain this - if you can you should give a lot more credence to this answer).
'step' anagrammed gives 'sept'.
'sept' enclosing 'l' is 'SLEPT'.
'of' is the link.
Can you help me to learn more?
(Other definitions for slept that I've seen before include "appeared still" , "Was dormant" , "Had room for" , "Slumbered" , "Napped, dozed" .)