Stumped band in series (6)
I believe the answer is:
string
'series' is the definition.
(string is a kind of series)
'stumped band' is the wordplay.
'stumped' becomes 'st' (I've seen this in other clues).
'band' becomes 'ring' ('ring' can be a synonym of 'band').
'st'+'ring'='STRING'
'in' is the link.
(Other definitions for string that I've seen before include "It's difficult to know how long a piece of it is" , "Series of events" , "Succession" , "A lightweight cord" , "Hard to say how long a piece of it is" .)