Wave at person leaving to get rid of intruders (3,3)
I believe the answer is:
see off
'wave' is the definition.
Both the answer and definition are verbs in their base form.
Maybe there's an association between them I don't understand?
'person leaving to get rid of intruders' is the wordplay.
I cannot quite understand how this works, but
'leaving' could be 'off' (as in 'I'm off') and 'off' is found in the answer.
'get' could be 'see' (both can mean to understand) and 'see' is present in the answer.
No letters remain.
This explanation may well be incorrect...
'at' is the link.
Can you help me to learn more?
(Other definitions for see off that I've seen before include "Accompany to point of departure, or chase away intruder" , "Repel; wave goodbye" , "Get rid off (colloq.)" , "Get rid of (someone)" , "Accompany to departure point, or defeat" .)