Blunder from star footballer, almost winning (4,2)
I believe the answer is:
mess-up
'blunder from star' is the definition.
'mess-up' can be an answer for 'blunder' (I've seen this in another clue). I am not certain of the 'from star' bit.
'footballer almost winning' is the wordplay.
'footballer' becomes 'messi' (footballer Lionel Messi).
'almost' means to remove the last letter (almost the whole word is kept).
'winning' becomes 'up' (eg being up at half time in football).
'messi' with its final letter removed is 'mess'.
'mess'+'up'='MESS-UP'
Can you help me to learn more?
(Other definitions for mess-up that I've seen before include "Handle (something) ineptly" , "Go wrong -- create disorder" , "Fiasco" , "Muddle - confusion" , "Muddle, bungle" .)