Strange Peter keeps a parrot (6)
I believe the answer is:
repeat
'parrot' is the definition.
(I've seen this in another clue)
'strange peter keeps a' is the wordplay.
'strange' indicates an anagram.
'keeps' means one lot of letters goes inside another (inserted letters are kept inside).
'peter' anagrammed gives 'repet'.
'repet' going around 'a' is 'REPEAT'.
(Other definitions for repeat that I've seen before include "Echo words" , "No new programme" , "Give another performance" , "Say, do or occur again" , "Duplicate" .)