Apply again after a time (6)
I believe the answer is:
relate
'apply' is the definition.
(I know that apply is a more specific form of the action relate)
'again after a time' is the wordplay.
'again' becomes 're' (prefix meaning 'again').
'after' means one lot of letters go next to another.
'a time' becomes 'late' (I can't justify this - if you can you should give a lot more credence to this answer).
're'+'late'='RELATE'
Can you help me to learn more?
(Other definitions for relate that I've seen before include "Recount" , "Do well; wave about" , "Describe an event" , "Narrate or associate" , "link" .)