14 across
PM,
or
less
important
office
(5)
PM, or less important office (5)
hints
0
checks
0
hints
The definition is at the end of the clue.
How the clue works
Right, so less important office is your definition there — a mayor's a step down from a prime minister, which is the little joke in the clue. For the wordplay, PM points you to MAY, the former Prime Minister, and you just stick OR straight onto the end of that to build MAYOR.