Player caught in a lock (7)
I believe the answer is:
actress
'player' is the definition.
(actress is a kind of player)
'caught in a lock' is the wordplay.
'caught' becomes 'c' (cricket abbreviation).
'in' indicates putting letters inside.
'lock' becomes 'tress' (I've seen this before).
'a'+'tress'='atress'
'c' going within 'atress' is 'ACTRESS'.
(Other definitions for actress that I've seen before include "Female in plays/films" , "One playing" , "Female player" , "Female thespian" , "Casters (anag.)" .)