Stick at the crease, being not out? (5)
I believe the answer is:
baton
'stick' is the definition.
(term for a stick or staff)
'the crease being not out?' is the wordplay.
'the crease being' becomes 'ba' (I can't justify this - if you can you should give a lot more credence to this answer).
'out?' indicates an anagram (out can mean wrong or inaccurate).
'not' is an anagram of 'ton'.
'ba'+'ton'='BATON'
'at' is the link.
Can you help me to learn more?
(Other definitions for baton that I've seen before include "Policeman's truncheon" , "Prohibition" , "A stick for a conductor and policeman" , "Conductor wields it - or a policeman" , "one watched by players" .)