Poet's son writes about uprising (7)
I believe the answer is:
spenser
'poet's' is the definition.
(I've seen this before)
'son writes about uprising' is the wordplay.
'son' becomes 's'.
'writes' becomes 'pens' ('pen' can be a synonym of 'write').
'about' becomes 're' (regarding**).
'uprising' says the letters should be written in reverse.
're' backwards is 'er'.
's'+'pens'+'er'='SPENSER'
(Other definitions for spenser that I've seen before include "Edmund ---, Eliz. poet" , "Edmund, 16th century poet" , "Old English poet" , "The Faerie Queene author" , "Edmund - , sixteenth century English poet" .)