Beckinsale secured by senior expert on the board? (6)
I believe the answer is:
skater
'expert on the board?' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps you can see a link between them that I don't see?
'beckinsale secured by senior' is the wordplay.
'beckinsale' becomes 'kate' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'secured by' is an insertion indicator (inserted letters are held or secured).
'senior' becomes 'sr' (abbreviation).
'kate' inserted inside 'sr' is 'SKATER'.
Can you help me to learn more?
(Other definitions for skater that I've seen before include "Insect on pond - person on ice" , "Athlete on blades" , "Ice sportsman" , "Glider on ice" , "Person sliding over ice" .)