I thought it remiss of Kate to give the clue to 13 across in plural form only for the answer to be in the singular to allow an A as third letter in 7 down. Also she stretched 17 across to have OFF as the ending instead of the usual OV
Sorry Minoru - remiss of me not to read the clue as well as your question. You are of course correct - Kate's clue does seem to be looking for a plural as the answer.