Small tower fell back into a gutter rut (6)

I believe the answer is:

turret

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

'small tower' is the definition.
(I've seen this in another clue)

'fell back into a gutter rut' is the wordplay.
'TURRET' is hidden back-to-front within the letters.
But, I'm uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for turret that I've seen before include "Small tower on defensive wall - or tank" , "Keep feature" , "Small tower, on tank or castle" , "Small tower (on castle, etc)" , "Tower-like projection on defensive wall" .)

I've seen this clue in the Sydney Morning Herald.

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