Three stumps and two bails (6)
I believe the answer is:
wicket
'three stumps and two bails' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for wicket that I've seen before include "Small gate; stumps, bails" , "Means of access" , "Three stumps and two bails" , "Three stumps plus a crosspiece" , "playing area" .)