Update is signal to save for later (3,5)
I believe the answer is:
put aside
'save for later' is the definition.
(I've seen this in another clue)
'update is signal' is the wordplay.
'update is' can be anagrammed to 'PUT ASIDE'.
Though, I am unsure how this is indicated.
'to' is the link.
Can you help me to learn more?
(Other definitions for put aside that I've seen before include "kept in reserve" , "shelved" .)