A second or two is no big deal (5-4)
I believe the answer is:
small-time
'no big deal' is the definition.
The definition suggests a singular noun which matches the answer.
'a second or two' is the wordplay.
I cannot really understand how this works, but
'a' is found in the answer.
'second' could be 'time' (time is a kind of second) and 'time' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
'is' acts as a link.
Can you help me to learn more?
(Other definitions for small-time that I've seen before include "Of minor importance" , "Insignificant" , "Petty (criminal, usually)" .)