Poet gives agreement about a time (5)
I believe the answer is:
yeats
'poet' is the definition.
(I know that Yeats is a poet)
'agreement about a time' is the wordplay.
'agreement' becomes 'yeas' (I can't explain this - if you can you should believe this answer much more).
'about' means one lot of letters goes inside another.
'a time' becomes 't' (abbreviation).
'yeas' going around 't' is 'YEATS'.
'gives' acts as a link.
Can you help me to learn more?
(Other definitions for yeats that I've seen before include "W.B. - (Irish poet)" , "W. B. -- , Irish poet/dramatist" , "William Butler ..., great Irish poet" , "Irish poet and dramatist, d. 1939" , "Poet William Butler or painter Jack B" .)