Fleet Street abandoning Star over crazy article (6)
I believe the answer is:
armada
'fleet street' is the definition.
'armada' can be an answer for 'fleet' (I've seen this in another clue). I'm not certain of the 'street' bit.
'abandoning star over crazy article' is the wordplay.
'abandoning star over' becomes 'ar' (I can't explain this - if you can you should give a lot more credence to this answer).
'crazy' becomes 'mad' (synonyms).
'article' becomes 'a' (the indefinite article in English).
'ar'+'mad'+'a'='ARMADA'
Can you help me to learn more?
(Other definitions for armada that I've seen before include "Large number of ships (Spanish?)" , "Fleet Drake defeated" , "Large flotilla" , "Large Spanish fleet" , "A great fleet - Spain had one" .)