Crossword Genius

Complain bitterly about the guard (4)

Ross

I believe the answer is:

rail

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

This clue could be a double definition.

'complain bitterly' is the first definition.
(I've seen this in another clue)

'the guard' is the second definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I don't see?

'about' acts as a link.

Can you help me to learn more?

(Other definitions for rail that I've seen before include "Barrier around lair" , "Line" , "Means of transport" , "Form of transport" , "Complain about - marsh bird" .)

I've seen this clue in the Evening Standard.
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