Treacherous woman: all hide, trembling (7)
I believe the answer is:
delilah
'treacherous woman' is the definition.
(woman who betrayed Samson in the Bible)
'all hide trembling' is the wordplay.
'trembling' is an anagram indicator.
'all'+'hide'='allhide'
'allhide' is an anagram of 'DELILAH'.
(Other definitions for delilah that I've seen before include "Temptress associated with Samson" , "Samson's destroyer" , "She cut Samson's hair" , "Tom Jones song" , "Samson's nemesis" .)