Soup that's twice what for Manuel? (6)
I believe the answer is:
bisque
'soup' is the definition.
(I know that bisque is a type of Fish soup)
'twice what for manuel?' is the wordplay.
'twice' becomes 'bis' (musical direction meaning to play a second time).
'what for manuel?' becomes 'que' ('what' in Spanish - Manuel is a Spanish name).
'bis'+'que'='BISQUE'
'that's' is the link.
(Other definitions for bisque that I've seen before include "Rich soup made from shellfish" , "Rich shellfish soup - lobster is nice" , "Rich soup as made from lobster" , "Thick shellfish soup" , "golf handicap" .)