Ticklish spots for hogs? (7)

I believe the answer is:

corners

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'ticklish spots' is the definition.
'corners' can be an answer for 'spots' (corner is a kind of spot). I am unsure of the 'ticklish' bit.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for corners that I've seen before include "Where lines meet or intersect" , "Points where two lines meet" , "Where lines meet to form angles" , "Places where sides meet" , "Nooks" .)

I've seen this clue in The Times.

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