Gets rid of detective books after relinquishing advance (7)
I believe the answer is:
dispels
'gets' is the definition.
The definition and answer can be both to do with motion as well as being verbs in their -s form.
Perhaps there's a link between them I don't understand?
'rid of detective books after relinquishing advance' is the wordplay.
I cannot quite see how this works, but
'detective' could be 'di' (Detective Inspector abbreviation) and 'di' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for dispels that I've seen before include "'Makes disappear, a doubt say (7)'" , "Scatters, drives away" .)