Father forces open boot, at last (6)
I believe the answer is:
priest
'father' is the definition.
(I've seen this in another clue)
'forces open boot at last' is the wordplay.
I cannot really understand how this works, but
'last' could be 't' (I've seen this in other clues) and 't' is found in the answer.
The remaining letters 'pries' 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?
(Other definitions for priest that I've seen before include "person of religion" , "Religious minister" , "Art looking into" , "Ordained minister" , "Stripe (anag)" .)