Word in poem is surprisingly about right (7)
I believe the answer is:
promise
'word' is the definition.
(I've seen this before)
'poem is surprisingly about right' is the wordplay.
'surprisingly' indicates an anagram (a surprising ordering of the letters).
'about' is an insertion indicator.
'right' becomes 'r' (common abbreviation).
'poem'+'is'='poemis'
'poemis' anagrammed gives 'pomise'.
'pomise' placed around 'r' is 'PROMISE'.
'in' acts as a link.
(Other definitions for promise that I've seen before include "Make a commitment" , "Potential excellence" , "Pledge - my word!" , "Vow" , "Give one's word" .)