Without knowing what 5 across is, this cannot be answered. If the Leinster is a reference to Leinster in Ireland, it is a province, not a county, so there may even be an error in the clue.
You will need to be part of the squad or part of the development process through their academy
There are various answers. It is on the east coast. It is in the province of Leinster. It is in the Republic of Ireland.
The Quinlan family name comes from County Meath. This is in the eastern part of Ireland, in the province of Leinster.
Its part of an event
in the black part of town
You can't find the black box alarm because it is an integral part of the control modules.
Geographically Leinster lies in the east of Ireland. It is part of what some people incorrectly refer to as "Southern Ireland". That is not an official name and it is geographically incorrect, as the most northerly point on the island of Ireland is actually in what some people refer to as the "south". See the maps below.
Eastern part of the Pinwheel Forest
Wexford is a county that is located in the Republic of Ireland. More specifically, Wexford is found in the Leinster province, which is in the southeastern part of Ireland.
Romania is situated in the South-Eastern part of Europe, near Black Sea.
L. N. Gupta has written: 'Growth trends of zircons from the northern part of the Leinster Granite' -- subject(s): Zircon
the 5th province was Meath - in todays terms it covered the northern part of the province of Leinster, including the counties of Meath, Westmeath, Longford and Louth