Recurring idea used in intro, perfect (5)
I believe the answer is:
trope
'recurring idea' is the definition.
I can't tell whether this definition defines the answer.
'in intro perfect' is the wordplay.
'in' indicates the answer is hidden within the clue.
'TROPE' is hidden in the letters of 'intro perfect'.
'used' is the link.
Can you help me to learn more?
(Other definitions for trope that I've seen before include "Metaphorical use of a word or expression" , "metaphor, perhaps" , "Figure of speech - or pet (anag)" , "literary effect" , "ironical expression" .)