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 tell whether this defines the answer.
'bridget jones occasionally' is the wordplay.
'occasionally' indicates alternate letters (letters taken at regular intervals or occasions).
'bridget'+'jones'='bridgetjones'
The alternate letters of 'bridgetjones' are 'BIG TOE'.
'shows' acts as a 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?" .)