Strong dope locked in boot (7)
I believe the answer is:
pungent
'strong' is the definition.
(I've seen this before)
'dope locked in boot' is the wordplay.
'dope' becomes 'gen' (both can mean information).
'locked in' is an insertion indicator.
'boot' becomes 'punt' (punt is a kind of boot).
'gen' going inside 'punt' is 'PUNGENT'.
(Other definitions for pungent that I've seen before include "Penetrating" , "spicy" , "Witty" , "Sharply tasting or smelling" , "Strong-smelling" .)