Some pang in animals? Certainly in humans! (6)
I believe the answer is:
angina
'some pang in animals? certainly in humans' is the definition.
I can't tell whether this defines the answer.
'some pang in animals? certainly' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'ANGINA' can be found hidden inside 'pang in animals certainly'.
(Other definitions for angina that I've seen before include "Painful heart complaint." , "Severe pain from heart disease" , "pain in the neck" , "medical condition" , "Cardiac complaint" .)