Just the coach for rough terrain (7)

I believe the answer is:

trainer

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

'just the coach' is the definition.
I can't tell whether this defines the answer.

'rough terrain' is the wordplay.
'rough' indicates an anagram (a rough or broken ordering of the letters).
'terrain' anagrammed gives 'TRAINER'.

'for' is the link.

Can you help me to learn more?

(Other definitions for trainer that I've seen before include "Terrain (anag.)" , "Sports shoe" , "Running shoe" , "Coach - item of footwear" , "Coach; shoe" .)

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