Express dissatisfaction with a break in service (8)

I believe the answer is:

complain

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

'express dissatisfaction' is the definition.
(I've seen this before)

'a break in service' is the wordplay.
I cannot really see how this works, but
'a' is within the answer.
'in' is within the answer.
This explanation may well be incorrect...

'with' is the link.

Can you help me to learn more?

(Other definitions for complain that I've seen before include "Grumble, carp" , "Lament" , "Remonstrate" , "Grizzle" , "Express a grievance" .)

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

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