Crossword Genius

Undersized sort of shirt causing irritation? (6)

Ross

I believe the answer is:

titchy

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'undersized sort' is the definition.
I know nothing about this answer so I can't tell whether this works.

'shirt causing irritation?' is the wordplay.
'shirt' becomes 't' (as in a T-shirt).
'causing irritation?' becomes 'itchy' (I've seen this before).
't'+'itchy'='TITCHY'

'of' is the link.

Can you help me to learn more?

(Other definitions for titchy that I've seen before include "Very small" , "Very short" , "Little" , "Tiny" .)

I've seen this clue in the Evening Standard.
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