13 across
Change
location
of
union
meeting
in
telephone
call?
(5)
Change location of union meeting in telephone call? (5)
hints
0
checks
0
hints
The definition is at the beginning of the clue.
How the clue works
See Change sitting there plain as day — that's your definition, it just means to alter. The rest of the clue is having a laugh by describing an ALTAR, the spot where a marriage union takes place — and "in telephone call" is the nudge telling you it's a homophone, sounding just like ALTER.