Crossword Genius

Something afoot for the coach (7)

Ross

I believe the answer is:

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

'coach' is the definition.
(as in a sports coach)

'something afoot for the' is the wordplay.
I cannot quite understand how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is present in the answer.
The remaining letters 'rainer' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for trainer that I've seen before include "Shoe; educator" , "Footwear singularly" , "Coach - one of a pair of shoes?" , "Person in charge of stable" , "Coach - item of footwear" .)

I've seen this clue in the Evening Standard.
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