Become discouraged as Larwood would if wicketless (4,5)
I believe the answer is:
lose heart
'become discouraged' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for lose heart that I've seen before include "get discouraged?" , "What patient may do before subsequent transplant" , "Start to despair" , "Here's a lot to cause courage to ebb" , "Become disillusioned" .)