They drive hearts in those who have faith? (9)

'they' is the definition.
Both the answer and definition are plural nouns.
Perhaps they are linked in a way I don't understand?

'drive hearts in those who have faith?' is the wordplay.
I cannot really see how this works, but
'drive' could be 'thrust' (synonyms) and 'thrust' is found within the answer.
The remaining letters 'ers' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?