Mind one scratching, having just turned up here for lottery (4,3)
I believe the answer is:
bran tub
'scratching having just turned up here for lottery' is the definition.
The definition suggests a singular noun which matches the answer.
'mind one' is the wordplay.
I cannot really understand how this works, but
'one' could be 'an' (I've seen this in other clues) and 'an' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for bran tub that I've seen before include "Container for lucky dip" , "Lucky-dip container" , "place for a dip" , "Gifts from here" .)