Expect a pound, say (5)
I believe the answer is:
await
'expect' is the definition.
(synonyms)
'a pound say' is the wordplay.
'pound say' becomes 'wait' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'a'+'wait'='AWAIT'
Can you help me to learn more?
(Other definitions for await that I've seen before include "Look forward to" , "Look for (something to happen)" , "Hid a microphone in; bothered" , "Expect, anticipate" , "Hope for" .)