Girl in the dock may be seen on a bicycle (7)
I believe the answer is:
pannier
'be seen on a bicycle' is the definition.
I can't judge whether this definition defines the answer.
'girl in the dock' is the wordplay.
'girl' becomes 'ann' (woman's name).
'in the' indicates putting letters inside.
'dock' becomes 'pier' (I've seen this before).
'ann' placed into 'pier' is 'PANNIER'.
'may' is the link.
Can you help me to learn more?
(Other definitions for pannier that I've seen before include "Bag carried on side of horse, bicycle etc" , "Basket on, eg, donkey" , "This will carry" , "dosser" , "Basket carried by animal" .)