Greet us clumsily and wave (7)
I believe the answer is:
gesture
'wave' is the definition.
'greet us clumsily' is the wordplay.
'clumsily' indicates an anagram.
'greet'+'us'='greetus'
'greetus' with letters rearranged gives 'GESTURE'.
'and' is the link.
(Other definitions for gesture that I've seen before include "Arm signal" , "Hand motion" , "Movement, indication" , "Message through movement" , "Sign with the hand" .)