Way person, having lost son, waves about arms (8)
I believe the answer is:
weaponry
'arms' is the definition.
('weaponry' can be a synonym of 'arms')
'way person having lost son waves' is the wordplay.
'having lost' is a deletion indicator.
'son' becomes 's'.
'waves' is an anagram indicator.
'way'+'person'='wayperson'
'wayperson' with 's' taken out is 'wayperon'.
'wayperon' is an anagram of 'WEAPONRY'.
'about' is the link.
(Other definitions for weaponry that I've seen before include "fighting equipment" , "Arms; artillery" , "All one's arms" , "Arsenal" , "Big guns" .)