Roswell wanting base to take alien order without researching satellite dish (5,4)
I believe the answer is:
swiss roll
'dish' is the definition.
(type of dessert dish)
'roswell wanting base to take alien order without researching satellite' is the wordplay.
'wanting' suggests deleting specific letters (to want something can mean to lack it or need it).
'base' becomes 'e' (Euler's number - base of natural logarithms).
'to take alien order' is an anagram indicator (an alien or unusual order of the letters).
'without' indicates putting letters inside ('without' can be similar in meaning to 'outside').
'researching satellite' becomes 'ISS' (International Space Station).
'roswell' with 'e' taken out is 'roswll'.
'roswll' is an anagram of 'swroll'.
'swroll' enclosing 'iss' is 'SWISS ROLL'.
(Other definitions for swiss roll that I've seen before include "Filled sponge cake" , "piece of cake?" , "Tumble down the ski slopes maybe" , "teatime treat?" , "Type of sponge cake" .)