Clue: Striking a flowing boundary up in Durham — it leads to century (8)
Answer: DRAMATIC
Explanation: Definition: Striking
An envelope ('in') of RAMAT, a reversal ('up' in a down light) of TAMAR ('a flowing boundary', the river which forms most of the boundary between Devon and Cornwall) in DI ('**D**urham **I**t leads') plus C ('century'). Good cricketing surface.