Former New Zealand Prime Minister Sir John Key has celebrated his second win in the space of a week with Word For Word diving in the final bound to land an overdue Rosehill victory.

Just days earlier, Key and his wife Lady Bronagh reportedly secured more than $6 million for the sale of their luxury Sydney harbour apartment.

Sir John, who stepped down as Prime Minister in 2016, is a part-owner of Word For Word along with former cricketer Terry Jarvis who played 13 Tests for New Zealand.

Word For Word showed staying promise as a three-year-old but has struggled to find the winner's circle since breaking her maiden in April last year.

Waller was happy to see her get the job done in Saturday's Yes Yes Yes New To Coolmore Handicap (1500m) at Rosehill, the mare powering late to nail favourite Bound To Win by a short half-head.

"She was running in all the lead-ups to the Queensland Oaks a year ago. She hasn't gone missing, but she has been a bit disappointing," Waller said.

"She hasn't gone to that next level.

"But she is back on track and she has been picking up some good prize money when she's not winning."

Word For Word was ridden by James McDonald, who was later slapped with a $1500 fine by stewards for breaching the number of times he was allowed to strike the mare with the whip before the 100m mark.