Sit with girl struggling to get skin cleaner (7)
I believe the answer is:
strigil
'skin cleaner' is the definition.
The definition suggests a singular noun which matches the answer.
'sit with girl struggling' is the wordplay.
'with' is a charade indicator (letters next to each other).
'struggling' indicates anagramming the letters (the letters struggle or wriggle into a new form).
'sit' after 'girl' is 'girlsit'.
'girlsit' anagrammed gives 'STRIGIL'.
'to get' acts as a link.
Can you help me to learn more?
(Another definition for strigil that I've seen is " Scraper".)