Crossword Genius

Travellers with a long-standing grievance? (12)

Ross

I believe the answer is:

straphangers

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

'travellers' is the definition.
(straphanger is a kind of traveller)

'a long-standing grievance?' is the wordplay.
I cannot really understand how this works, but
'a' could be 'an' and 'an' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

'with' is the link.

Can you help me to learn more?

I've seen this clue in The Globe and Mail.
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