Crack about taking in queen's minder (8)
I believe the answer is:
chaperon
'minder' is the definition.
(I've seen this before)
'crack about taking in queen's' is the wordplay.
'crack' becomes 'chap' (chapping is a kind of cracking).
'about' says the letters should be written in reverse.
'taking in queen's' becomes 'nore' (I am not sure about this - if you are sure you should believe this answer much more).
'nore' written backwards gives 'eron'.
'chap'+'eron'='CHAPERON'
(Other definitions for chaperon that I've seen before include "Accompany and look after" , "Person accompanying girl or younger group" , "One accompanies to supervise" , "Woman supervising girl" , "Preach on about older woman in charge of girl" .)