Clue: Women's part of test? Attempt, having secured a get-up that ensures success (7,8)
Answer: WINNING STRATEGY
Explanation: Definition: that ensures success
A charade of W ('women') plus INNINGS ('part of test' cricket) plus TRATEGY, a envelope ('having secured') of 'a' plus TEG, a reversal (-'up' in a down light) of 'get'- in TRY ('attempt').