Said hi to alien in avarice (7)
I believe the answer is:
greeted
'said hi' is the definition.
(I've seen this in another clue)
'alien in avarice' is the wordplay.
'alien' becomes 'et' (extra terrestrial).
'in' means one lot of letters goes inside another.
'avarice' becomes 'greed' (synonyms).
'et' inserted inside 'greed' is 'GREETED'.
'to' is the link.
(Other definitions for greeted that I've seen before include "Said hello" , "Acknowledged" , "Saluted, hailed" , "Welcomed warmly" .)