Tin tickle felt in theft (6)
I believe the answer is:
snitch
'theft' is the definition.
(I know that snitch is a more specific form of the action the theft)
'tin tickle' is the wordplay.
'tin' becomes 'Sn' (Sn is the chemical symbol for tin).
'tickle' becomes 'itch' (I've seen this before).
'sn'+'itch'='SNITCH'
'felt in' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for snitch that I've seen before include "who tells on his classsmate?" , "Grass" , "Inform on someone in slangy way" , "I'm telling!" , "Inform on, tell tales" .)