Quilt from Venice originally seized by performing pair (5)
I believe the answer is:
duvet
'quilt' is the definition.
(duvet is a kind of quilt)
'venice originally seized by performing pair' is the wordplay.
'originally' says to take the initial letters.
'seized by' means one lot of letters goes inside another.
'performing pair' becomes 'duet'.
The initial letter of 'venice' is 'v'.
'v' placed within 'duet' is 'DUVET'.
'from' is the link.
(Other definitions for duvet that I've seen before include "Bed quilt" , "Continental quilt" , "Thick soft quilt instead of bedclothes" , "Type of quilt" , "Warmer" .)