Hotter MiG replaced British plane (5,4)
I believe the answer is:
tiger moth
'british plane' is the definition.
'tiger moth' can be an answer for 'plane' (de Havilland Tiger Moth is a type of plane). I am not sure about the 'british' bit.
'hotter mig replaced' is the wordplay.
'replaced' indicates an anagram.
'hotter'+'mig'='hottermig'
'hottermig' anagrammed gives 'TIGER-MOTH'.
Can you help me to learn more?
(Other definitions for tiger moth that I've seen before include "producer of woolly bears" , "this one has brightly-coloured wings" , "Spotted flyer" , "Woolly bear" , "Insect - aeroplane" .)