Extravagant chap secures love seat (7)
I believe the answer is:
ottoman
'seat' is the definition.
(ottoman is a kind of seat)
'extravagant chap secures love' is the wordplay.
'extravagant' becomes 'ott' (I've seen this in other clues).
'chap' becomes 'man' (I've seen this before).
'secures' is an insertion indicator.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'ott'+'man'='ottman'
'ottman' going around 'o' is 'OTTOMAN'.
(Other definitions for ottoman that I've seen before include "item of furniture" , "Shared seat" , "lacking arms and backing" , "Couch for a Turk" , "Turkish empire of over 600 years" .)