Straighten a sentence in report (5)
I believe the answer is:
align
'straighten' is the definition.
(I've seen this before)
'a sentence in report' is the wordplay.
'sentence in report' becomes 'lign' (I can't explain this - if you can you should give a lot more credence to this answer).
'a'+'lign'='ALIGN'
Can you help me to learn more?
(Other definitions for align that I've seen before include "Arrange so as to be parallel" , "Get straight" , "Make (things) fit together" , "Arrange in a row" , "Join as ally of malignant sort (5)" .)