Wild cat — he twice spotted one in the Serengeti (7)
I believe the answer is:
cheetah
'wild cat he twice spotted one in the serengeti' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'wild cat he twice' is the wordplay.
'he twice' means two replacements for 'he'.
'wild' indicates anagramming the letters.
'cat'+'he'+'he'='cathehe'
'cathehe' anagrammed gives 'CHEETAH'.
Can you help me to learn more?
(Other definitions for cheetah that I've seen before include "Feline, the fastest mammal" , "African native" , "16 21 [INDIAN IMPORT]" , "Fast-running creature" , "Fastest cat" .)