Small, fat, short, thick and strong (6)

I believe the answer is:

stubby

I'm a little stuck... Click here to teach me more about this clue!

'short thick and strong' is the definition.
I can't judge whether this defines the answer.

'small fat' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'fat' becomes 'tubby' (similar in meaning).
's'+'tubby'='STUBBY'

Can you help me to learn more?

(Other definitions for stubby that I've seen before include "Short, thick and strong" , "Squat" , "Thickset" , "Short and blunt" .)

I've seen this clue in The Guardian.

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