Leader of revolt liable to be transported (4)
I believe the answer is:
rapt
'transported' is the definition.
(I've seen this before)
'leader of revolt liable' is the wordplay.
'leader of' suggests taking the first letters.
'liable' becomes 'apt' ('apt' can be a synonym of 'liable').
The initial letter of 'revolt' is 'r'.
'r'+'apt'='RAPT'
'to be' acts as a link.
(Other definitions for rapt that I've seen before include "Fully engaged" , "'Transported, entranced (4)'" , "Fully absorbed" , "Absorbed, fascinated" , "Delighted" .)