They have faith in model with hold-up stockings to begin with (7)
I believe the answer is:
theists
'they have faith' is the definition.
The definition suggests an adverb but the answer is not.
'model with hold-up stockings to begin with' is the wordplay.
'model' becomes 'T' (Ford Model T car).
'with' is a charade indicator (letters next to each other).
'hold-up' becomes 'heist' (I've seen this before).
'to begin with' says to take the initial letters.
The initial letter of 'stockings' is 's'.
't'+'heist'+'s'='THEISTS'
'in' is the link.
Can you help me to learn more?
(Other definitions for theists that I've seen before include "Believers" , "religious people" , "people who believe in God" .)