Drop reserve on team (7)
I believe the answer is:
subside
'drop' is the definition.
(thesaurus)
'reserve on team' is the wordplay.
'reserve' becomes 'sub' (I've seen this in other clues).
'on' means one lot of letters go next to another.
'team' becomes 'side' (I've seen this before**).
'sub'+'side'='SUBSIDE'
(Other definitions for subside that I've seen before include "Abate" , "Wear off or die down" , "Fall back" , "Sink, settle" , "Cave in" .)