She plays with account lock (7)
I believe the answer is:
actress
'she plays with account lock' is the definition.
I can't tell whether this definition defines the answer.
'with account lock' is the wordplay.
'with' means one lot of letters go next to another.
'account' becomes 'ac' (abbreviation).
'lock' becomes 'tress' (both can mean a piece of hair).
'ac'+'tress' is 'ACTRESS'.
Can you help me to learn more?
(Other definitions for actress that I've seen before include "Garland perhaps" , "Terry, say" , "one with a particular role?" , "dame on stage?" , "Stage performer" .)