Mistakenly replace y with w in 'yell' to find something small and unpleasant (6-6)
I believe the answer is:
creepy-crawly
'find something small and unpleasant' is the definition.
I can't judge whether this definition defines the answer.
'mistakenly replace y with w in yell' is the wordplay.
'mistakenly' indicates an anagram.
'with' is a charade indicator (letters next to each other).
'in' is an insertion indicator.
'yell' becomes 'cry' (synonyms).
'replace'+'y'+'w'='replaceyw'
'replaceyw' is an anagram of 'eepycrawl'.
'eepycrawl' placed into 'cry' is 'CREEPY-CRAWLY'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for creepy-crawly that I've seen before include "Insect" , "Sinister wriggling beast?" , "Worm or spider, say" .)