Keep one's hand in and scrape it off (8)
I believe the answer is:
practise
'keep one's hand in' is the definition.
I can't tell whether this defines the answer.
'scrape it off' is the wordplay.
'off' indicates anagramming the letters.
'scrape'+'it'='scrapeit'
'scrapeit' anagrammed gives 'PRACTISE'.
'and' acts as a link.
Can you help me to learn more?
(Other definitions for practise that I've seen before include "Contrive by some means" , "Drill" , "Do something to improve skill, train" , "Rehearse" , "Train by repetition" .)