20 down
Solvers
on
underground
platform
(7)
Solvers on underground platform (7)
hints
0
checks
0
hints
The definition is at the end of the clue.
How the clue works
Look at platform — that's your definition, with YouTube being the online video platform. YOU means solvers, as in the people doing this very crossword, and TUBE gives you the underground (the London kind), so put them together and there's your answer.