Stick — at the crease, perhaps? (5)
I believe the answer is:
baton
'crease perhaps?' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'stick at' is the wordplay.
'stick' becomes 'bat' (bat is a type of stick).
'at' becomes 'on' (location).
'bat'+'on'='BATON'
'the' acts as a link.
(Other definitions for baton that I've seen before include "Short stick" , "Light wand" , "Relay runner's stick" , "one watched by players" , "Conductor wields it - or a policeman" .)