Stupidly lets cook put rum in starter (4,6,4)
I believe the answer is:
mock turtle soup
'starter' is the definition.
(I've seen this before)
'stupidly lets cook put rum' is the wordplay.
'stupidly' is an anagram indicator (a stupid ordering of the letters).
'lets'+'cook'+'put'+'rum'='letscookputrum'
'letscookputrum' with letters rearranged gives 'MOCK TURTLE SOUP'.
'in' acts as a link.
(Other definitions for mock turtle soup that I've seen before include "for which bovine head is used as substitute" , "First course" , "starter" .)