Crossword Genius

A rare win involved Wellingtons (8)

Ross

I believe the answer is:

rainwear

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

'a rare win involved wellingtons' is the definition.
I can't tell whether this defines the answer.

'a rare win involved' is the wordplay.
'involved' indicates anagramming the letters (involved can mean confusing or complex).
'a'+'rare'+'win'='ararewin'
'ararewin' anagrammed gives 'RAINWEAR'.

Can you help me to learn more?

(Other definitions for rainwear that I've seen before include "Waterproof clothing" , "Coats" , "Waterproof clothes" , "This should keep him dry" , "Gear for wet weather" .)

I've seen this clue in The Mirror.
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