Pet also pummelled Peter, perhaps (7)
I believe the answer is:
apostle
'peter perhaps' is the definition.
(peter is a kind of Apostle)
'pet also pummelled' is the wordplay.
'pet also' anagrams to 'APOSTLE'.
However, I'm not clear how the anagram is indicated.
Can you help me to learn more?
(Other definitions for apostle that I've seen before include "'Matthew or Mark, say (7)'" , "who can handle a spoon?" , "[JAMES] , for one?" , "A follower of Jesus" , "Ale pots (anag)" .)