Crossword Genius

Ahsanpur railway's engine sound? (4)

Ross

I believe the answer is:

purr

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

'engine sound?' is the definition.
(I've seen this in another clue)

'ahsanpur railway's' is the wordplay.
'PURR' is hidden in amongst the letters.
But, I'm uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for purr that I've seen before include "Cat noise" , "Soft sound from car or cat" , "content? I might" , "Appreciative feline sound" , "Cat's coo" .)

I've seen this clue in The Sun.
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