A club dream, surprisingly, securing new lampholder (11)
I believe the answer is:
candelabrum
'lampholder' is the definition.
(type of candlestick for multiple candles)
'a club dream surprisingly securing' is the wordplay.
'a' becomes 'an'.
'surprisingly' indicates anagramming the letters.
'securing' means one lot of letters goes inside another.
'club'+'dream'='clubdream'
'clubdream' is an anagram of 'cdelabrum'.
'an' inserted into 'cdelabrum' is 'CANDELABRUM'.
'new' acts as a link.
This may not be right. It may belong to another bit of the clue.
(Other definitions for candelabrum that I've seen before include "Source of light when lit" , "should be left hanging from the ceiling!" , "Light accompaniment to" , "Lamp-holder" , "lamp holder" .)