... Nanna upset about ultimately flat English dish? (7)
I believe the answer is:
antenna
'dish?' is the definition.
(as in a satellite dish)
'nanna upset about ultimately flat english' is the wordplay.
'upset' indicates an anagram.
'about' means one lot of letters goes inside another.
'ultimately' says to take the final letters.
'english' becomes 'E' (abbreviation).
The last letter of 'flat' is 't'.
'nanna' is an anagram of 'annna'.
't'+'e'='te'
'annna' placed around 'te' is 'ANTENNA'.
(Other definitions for antenna that I've seen before include "Insect's feeler" , "What detects signals" , "Transmitting aerial" , "receiver" , "Feeling part" .)