Alluring woman’s anger in outskirts of Saigon (5)
I believe the answer is:
siren
'alluring woman's' is the definition.
(I've seen this before)
'anger in outskirts of saigon' is the wordplay.
'anger' becomes 'ire' ('ire' can be a synonym of 'anger').
'in' means one lot of letters goes inside another.
'outskirts of' says to hollow out the word (remove centre letters).
'saigon' with its middle taken out is 'sn'.
'ire' inserted within 'sn' is 'SIREN'.
(Other definitions for siren that I've seen before include "Alarm; temptress" , "Loud whistle or sailors' enchantress" , "Dangerously fascinating woman" , "Warning sound" , "Loud whistle or dangerous woman" .)