Messi's header getting kid excited about minute when Champions League opponents meet? (3-4)
I believe the answer is:
mid-week
'champions league opponents meet?' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'messi's header getting kid excited about minute' is the wordplay.
'header' suggests taking the first letters (in a down clue, the letter at the top of the word).
'getting' means one lot of letters go next to another.
'excited' is an anagram indicator.
'about' indicates putting letters inside.
'minute' becomes 'wee' (I've seen this in another clue).
The initial letter of 'messi' is 'm'.
'kid' is an anagram of 'idk'.
'idk' going around 'wee' is 'idweek'.
'm'+'idweek'='MID-WEEK'
'when' acts as a link.
Can you help me to learn more?