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Groom in stress after removing top (5)

Ross

I believe the answer is:

train

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

'groom' is the definition.
(synonyms)

'stress after removing top' is the wordplay.
I cannot quite see how this works, but
'top' could be 'ai' (I've seen this in other clues) and 'ai' is located in the answer.
This explanation may well be incorrect...

'in' acts as a link.

Can you help me to learn more?

(Other definitions for train that I've seen before include "Following" , "Succession of carriages" , "Railway engine" , "Suite; give practice (in)" , "Number of animals moving in a line, like camels" .)

I've seen this clue in The Hindu.
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