Having a problem with a few clues today.
16A express willingness to take up a challenge (5,4,3,4,3,4) I have Throw ones cap I??? The ring.
50 the situation has reversed (3,4,2,2,3,5,4)
??E/?O?T/??/?N/???/O?H?R/?O??
53A bringing to mind strong images (9) ??O?A?I??