As a result of running late, take a moment and not more (10)
I believe the answer is:
breathless
'as a result of running late' is the definition.
I can't tell whether this defines the answer.
'a moment and not more' is the wordplay.
'a moment' becomes 'breath' (I can't explain this - if you can you should believe this answer much more).
'and' is a charade indicator (letters next to each other).
'not more' becomes 'less' ('less' is the opposite to 'more').
'breath'+'less'='BREATHLESS'
'take' acts as a link.
Can you help me to learn more?
(Other definitions for breathless that I've seen before include "Still" , "panting?" , "Short-winded" , "Spent" , "Gasping for air" .)