Arrest some felon in time (5)
I believe the answer is:
delay
'arrest' is the definition.
(thesaurus)
'felon in time' is the wordplay.
'felon' becomes 'el' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'in' means one lot of letters goes inside another.
'time' becomes 'day' (day is a kind of time).
'el' going inside 'day' is 'DELAY'.
'some' is the link.
Can you help me to learn more?
(Other definitions for delay that I've seen before include "Put off until later" , "Put off; pause" , "Postponement" , "Defer; make late" , "Procrastinate - put off" .)