When there's rain about, one can have a bit of luck with the pitch (6)
I believe the answer is:
wicket
'pitch' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'when there's rain about one can have a bit of luck with the' is the wordplay.
I cannot really understand how this works, but
'when' could be 'e' (I've seen this in other clues) and 'e' is found within the answer.
'about' could be 'c' (abbreviation for circa) and 'c' is found in the answer.
'one' could be 'i' (Roman numeral) and 'i' is present in the answer.
'with' could be 'w' (abbreviation) and 'w' is present in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is present in the answer.
A single letter 'k' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for wicket that I've seen before include "Small gate, for a cricketer?" , "playing area" , "Three stumps plus a crosspiece" , "Stump" , "Stumps and bails construction - success for a bowler" .)