Train me in clothing (7)

I believe the answer is:

raiment

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

'clothing' is the definition.
(raiment is a kind of clothing)

'train me' is the wordplay.
'train me' can be anagrammed to 'RAIMENT'.
However, I'm not clear how the anagram is indicated.

'in' is the link.

Can you help me to learn more?

(Other definitions for raiment that I've seen before include "Especially fine or decorative clothing" , "Traditional clothing" , "Attire" , "Garment" , "Clothing (literary)" .)

I've seen this clue in The Irish Independent.

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