10 across
Partner
once
put
on
green
top
(6)
Partner once put on green top (6)
hints
0
checks
0
hints
The definition is at the end of the clue.
How the clue works
Look at top at the end — that's your definition, meaning the highest point or apex. Green gives you VERT (the heraldic term for green), and partner once gives you EX, which gets "put on" (added to) it.