Spotted US President now doing U-turn? Not fully (5-3)
I believe the answer is:
polka-dot
'spotted' is the definition.
(I've seen this before)
'us president now doing u-turn? not fully' is the wordplay.
'us president' becomes 'polk' (I've seen this in other clues).
'now' becomes 'AD' (AD, Anno Domini, as opposed to BC, Before Christ).
'doing u-turn?' shows that the letters should be reversed in order.
'not fully' becomes 'to' (I can't justify this - if you can you should believe this answer much more).
'to' written backwards gives 'ot'.
'polk'+'ad'+'ot'='POLKA-DOT'
Can you help me to learn more?
(Other definitions for polka-dot that I've seen before include "Patterned with large spots" , "(Of fabric) covered in small, circular regularly-spaced spots" .)