Perhaps glimpse a sin arising and step on it (4,5)
I believe the answer is:
look alive
'perhaps glimpse' is the definition.
I don't know anything about this answer so I can't tell whether this works.
'a sin arising and step on it' is the wordplay.
'sin' becomes 'evil' (I've seen this before).
'arising' says the letters should be written in reverse.
'and' says to put letters next to each other.
'step on it' becomes 'look' (I can't justify this - if you can you should believe this answer much more).
'evil' written backwards gives 'live'.
'a'+'live'='alive'
'alive' after 'look' is 'LOOK ALIVE'.
Can you help me to learn more?
(Another definition for look alive that I've seen is " Come on".)