Rest to apply again - I'm leaving (6)
I believe the answer is:
repose
'rest' is the definition.
(synonyms)
'apply again i'm leaving' is the wordplay.
I cannot really understand how this works, but
'again' could be 're' and 're' is present in the answer.
The remaining letters 'pose' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'to' is the link.
Can you help me to learn more?
(Other definitions for repose that I've seen before include "place" , "peace" , "Quiet restfulness" , "Relaxation" , "State of tranquillity" .)