Poke with end of sharp stick (4)
I believe the answer is:
prod
'poke' is the definition.
(I know that poke can be written as prod)
'with end of sharp stick' is the wordplay.
'with' means one lot of letters go next to another.
'end of' indicates one should take the final letters.
'stick' becomes 'rod' (I've seen this before).
The final letter of 'sharp' is 'p'.
'p' put next to 'rod' is 'PROD'.
(Other definitions for prod that I've seen before include "Provide stimulation" , "Poke with a stick" , "Stimulus" , "Poke, stimulate into action" , "Drop (anag.)" .)