Initially Sadio Mane may be penetrating football club on the counter - one that looks disorganised (6)
I believe the answer is:
scruff
'one that looks disorganised' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'initially sadio mane may be penetrating football club on the counter' is the wordplay.
'initially' says to take the initial letters.
'mane may' becomes 'fur' (I can't explain this - if you can you should give a lot more credence to this answer).
'be penetrating' indicates putting letters inside.
'football club' becomes 'FC'.
'on the counter' shows that the letters should be reversed in order (counter can mean in the opposite direction).
The initial letter of 'sadio' is 's'.
'fur' placed inside 'fc' is 'ffurc'.
'ffurc' written backwards gives 'cruff'.
's'+'cruff'='SCRUFF'
Can you help me to learn more?
(Other definitions for scruff that I've seen before include "The back side of the neck" , "One hardly washing" , "Unkempt individual" , "Dirty, ill-dressed person" , "Nape; untidy type" .)