Don't come - give support elsewhere (4,4)
I believe the answer is:
stay away
'don't come' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.
'give support elsewhere' is the wordplay.
'give' says to put letters next to each other.
'support' becomes 'stay' (stay is a kind of support).
'elsewhere' becomes 'away' (I've seen this before).
'stay' next to 'away' is 'STAY AWAY'.
Can you help me to learn more?
(Other definitions for stay away that I've seen before include "Remain absent, don't come back" , "Don't attend" .)