Transported herd: all ten let loose (10)
I believe the answer is:
enthralled
'transported' is the definition.
('enthral' can be a synonym of 'transport')
'herd all ten let loose' is the wordplay.
'let loose' indicates anagramming the letters.
'herd'+'all'+'ten'='herdallten'
'herdallten' with letters rearranged gives 'ENTHRALLED'.
(Other definitions for enthralled that I've seen before include "Spellbound" , "Captivated" .)