Playing together, except for number about one that's Scottish (6)
I believe the answer is:
toying
'playing' is the definition.
('toy' can be a synonym of 'play')
'together except for number about one that's scottish' is the wordplay.
I cannot quite see how this works, but
'for' could be 'to' (eg both can mean 'in the opinion of') and 'to' is found within the answer.
'number' could be 'i' (I is an example) and 'i' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for toying that I've seen before include "Playing (with an idea, for example)" , "Idly playing (with)" , "Engage in some activity as if it were a game" .)