Flying team ace, heartless menace in battle (2,7)
I believe the answer is:
el alamein
'battle' is the definition.
(Second World War battle)
'flying team ace heartless menace in' is the wordplay.
'flying team' becomes 'elal' (I can't justify this - if you can you should believe this answer much more).
'ace' becomes 'a' (abbreviation).
'heartless' says to hollow out the word (remove centre letters).
'menace' with its middle removed is 'me'.
'elal'+'a'+'me'+'in'='EL ALAMEIN'
Can you help me to learn more?
(Other definitions for el alamein that I've seen before include "North African World War two battle" , "victory" , "WWII battle" , "Place in Egypt where Montgomery defeated Rommel" , "North African WW2 battle site" .)