Bridget Jones occasionally shows part of her bottom (3,3)
I believe the answer is:
big toe
'part of her bottom' is the definition.
I can't judge whether this definition defines the answer.
'bridget jones occasionally' is the wordplay.
'occasionally' means one should take alternating letters (letters taken at regular intervals or occasions).
'bridget'+'jones'='bridgetjones'
The alternating letters of 'bridgetjones' are 'BIG TOE'.
'shows' is the link.
Can you help me to learn more?
(Other definitions for big toe that I've seen before include "Largest foot digit" , "Corn grows here" , "member of the body" , "Largest pedal extremity" , "that once went to market?" .)