A girl bowled over? (6)
I believe the answer is:
maiden
'over?' is the definition.
(maiden is a kind of over)
'a girl bowled' is the wordplay.
'a girl' becomes 'maid' (maid is a kind of girl).
'bowled' becomes 'en' (I can't justify this - if you can you should believe this answer much more).
'maid'+'en'='MAIDEN'
Can you help me to learn more?
(Other definitions for maiden that I've seen before include "Damsel" , "Spinster" , "Miss" , "First (speech)" , "Dotty over" .)