Naughtily erotic, can create an increase in size (9)
I believe the answer is:
accretion
'an increase in size' is the definition.
I can't tell whether this definition defines the answer.
'naughtily erotic can' is the wordplay.
'naughtily' indicates an anagram.
'erotic'+'can'='eroticcan'
'eroticcan' with letters rearranged gives 'ACCRETION'.
'create' acts as a link.
Can you help me to learn more?
(Other definitions for accretion that I've seen before include "Extra amount" , "Something added" , "extra part" , "Gradual growth, increase" .)