Detains chap tucking into wines (7)
I believe the answer is:
remands
'detains' is the definition.
(remanding is a kind of detaining)
'chap tucking into wines' is the wordplay.
'chap' becomes 'man' (chap can mean a man).
'tucking into' is an insertion indicator.
'wines' becomes 'reds'.
'man' placed inside 'reds' is 'REMANDS'.
(Other definitions for remands that I've seen before include "Returns to custody pending further evidence" , "Sends back" , "Returns prisoner to custody while investigation proceeds" , "Consigns to prison to await trial" , "Returns prisoner to custody while further evidence is sought" .)