Expect a stone, say (5)
I believe the answer is:
await
'expect' is the definition.
(synonyms)
'a stone say' is the wordplay.
'stone say' becomes 'wait' (I am not sure about this - if you are sure you should believe this answer much more).
'a'+'wait'='AWAIT'
Can you help me to learn more?
(Other definitions for await that I've seen before include "Remain in expectation for (an occurrence)" , "Look out for - expect" , "Look for; be in store" , "Look for (something to happen)" , "Stay around for" .)